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CBSE · Class 9 · Science

Describing Motion Around Us

Standard difficulty · 20 questions · 40 marks

Name: Date: Score: ____ / 40

Show your working for Sections B and C. Answers are on the last page — try every question first!

Section A — Choose the correct answer8 × 1 = 8 marks
1.
A car travels 160 km in 4 hours. Its average speed is:
  1. 44 km/h
  2. 640 km/h
  3. 80 km/h
  4. 40 km/h
2.
A speed of 180 km/h in m/s is:
  1. 50 m/s
  2. 648 m/s
  3. 180 m/s
  4. 55 m/s
3.
A body's velocity changes from 7 m/s to 10 m/s in 3 s. Its acceleration is:
  1. 3 m/s2
  2. 2 m/s2
  3. 3.33 m/s2
  4. 1 m/s2
4.
An athlete runs exactly one full round of a circular track of radius 56 m. The magnitude of the displacement is:
  1. 0 m
  2. 352 m
  3. 112 m
  4. 56 m
5.
The SI unit of speed is:
  1. m/s
  2. m/s2
  3. m
  4. km/h
6.
A car starts at 11 m/s and accelerates at 6 m/s2 for 8 s. Its final velocity is:
  1. 94 m/s
  2. 48 m/s
  3. 17 m/s
  4. 59 m/s
7.
A body with initial velocity 2 m/s accelerates at 6 m/s2 for 6 s. The distance covered is:
  1. 12 m
  2. 228 m
  3. 120 m
  4. 126 m
8.
Assertion (A): A car speeding up uniformly from 0 m/s to 42 m/s in 7 s has an acceleration of 8 m/s2.
Reason (R): Acceleration = (final velocity − initial velocity) ÷ time taken.
  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, but R is true.
Section B — Short answer8 × 2 = 16 marks
9.
A bus travels at 57 km/h for 4 h and then at 35 km/h for 4 h. Find its average speed. (Give the answer to 2 decimal places where needed.)
10.
A car moving at 11 m/s is brought to rest in 8 s. Find its acceleration. (Give the answer to 2 decimal places where needed.)
11.
A car moving at 24 m/s brakes with a retardation of 5 m/s2. How far does it travel before stopping? (Give the answer to 2 decimal places where needed.)
12.
A body reaches 55 m/s after accelerating at 4 m/s2 for 10 s. Find its initial velocity.
13.
An object covers 187 m in 17 s at a uniform speed. How long will it take to cover 1,122 m?
14.
A body starts at 8 m/s and accelerates at 6 m/s2 over a distance of 3 m. Find its final velocity.
15.
The velocity of a scooter rises uniformly from 0 to 36 m/s in 19 s. Using the area under the velocity–time graph, find the distance covered. (Give the answer to 2 decimal places where needed.)
16.
Kabir walks 26 m east and then 157 m west. Find the distance travelled and the displacement.
Section C — Word problems4 × 4 = 16 marks
17.
A train starts from rest and accelerates uniformly at 2 m/s2 for 6 s. Find its final speed and the distance it covers. (Give the answer to 2 decimal places where needed.)
18.
A bus moving at 108 km/h is stopped in 7 s by applying brakes. Find the retardation and the distance it travels while stopping. (Give the answer to 2 decimal places where needed.)
19.
Two cars cover a distance of 240 km, one at 40 km/h and the other at 90 km/h. How many minutes earlier does the faster car arrive? (Give the answer to 2 decimal places where needed.)
20.
An athlete completes one round of a circular track of radius 28 m in 30 s. What distance has the athlete covered, and what is the displacement, after 135 s? (π = 22/7)
AmbifulWorksheets
Practice that never repeats
CBSE · Class 9 · Science

Answer key

Describing Motion Around Us · AW-9S-MOT-2026-V1 · For parents — fold back or tear off before handing the sheet to your child.

QAnswerWorking
1(d) 40 km/h160 ÷ 4 = 40
2(a) 50 m/s× 5/18: 180 × 5/18 = 50
3(d) 1 m/s2(10 − 7) ÷ 3 = 1
4(a) 0 mback at the start: displacement is zero
5(a) m/s—
6(d) 59 m/sv = u + at = 11 + 6 × 8
7(c) 120 ms = ut + ½at2 = 12 + 108
8(d) A is false, but R is true.A is false: (42 − 0) ÷ 7 = 6, not 8. R is true.
946 km/htotal distance 368 km ÷ total time 8 h
10−1.38 m/s2a = (0 − 11) ÷ 8; the minus sign means it is slowing down
1157.6 mv2 − u2 = 2as: 0 − 576 = 2 × (−5) × s
1215 m/su = v − at = 55 − 40
13102 sspeed = 11 m/s; 1122 ÷ 11
1410 m/sv2 = u2 + 2as = 64 + 36 = 100
15342 marea of the triangle = ½ × 19 × 36
16distance 183 m; displacement 131 m westdistance 26 + 157; displacement 157 − 26
1712 m/s; 36 mv = at = 12; s = ½at2 = ½ × 2 × 36
184.29 m/s2; 105 m108 km/h = 30 m/s; a = 30 ÷ 7; s = ½ × 30 × 7
19200 minutestimes 6 h and 2.67 h; difference × 60
20distance 792 m; displacement 56 m135 s = 4 ½ rounds; distance = 4 ½ × 2πr; displacement = diameter = 56 m