Measurement of Motion and Time

Class 7 – Motion, Distance and Speed (Worksheet with Solutions)

Question 1

Calculate the speed of a car that travels 150 metres in 10 seconds. Express your answer in km/h.

• Speed = Distance ÷ Time = 150 ÷ 10 = 15 m/s
• In km/h: 15 × 3.6 = 54 km/h

Question 2

A runner completes 400 metres in 50 seconds. Another runner completes the same distance in 45 seconds. Who has a greater speed and by how much?

• Runner A = 400 ÷ 50 = 8 m/s
• Runner B = 400 ÷ 45 ≈ 8.89 m/s
• Difference = 8.89 − 8.00 = 0.89 m/s. Runner B is faster.

Question 3

A train travels at a speed of 25 m/s and covers a distance of 360 km. How much time does it take?

• Convert speed to km/h: 25 × 3.6 = 90 km/h
• Time = Distance ÷ Speed = 360 ÷ 90 = 4 hours

Question 4

A train travels 180 km in 3 h. Find its speed in:
(i) km/h (ii) m/s (iii) What distance will it travel in 4 h if it maintains the same speed throughout the journey?

(i) 180 ÷ 3 = 60 km/h
(ii) 60 ÷ 3.6 = 16.67 m/s
(iii) 60 × 4 = 240 km

Question 5

The fastest galloping horse can reach the speed of approximately 18 m/s. How does this compare to the speed of a train moving at 72 km/h?

• 72 ÷ 3.6 = 20 m/s
• Train is faster by 20 − 18 = 2 m/s

Question 6

Distinguish between uniform and non-uniform motion using the example of a car moving on a straight highway with no traffic and a car moving in city traffic.

Uniform Motion:
• Equal distance in equal intervals
• Car on highway moves at steady speed

Non-uniform Motion:
• Unequal distance in equal intervals
• Car in city traffic keeps starting and stopping

Question 7

Data for an object covering distances in different intervals of time are given in the following table. If the object is in uniform motion, fill in the gaps in the table:

Time (s)	0	10	20	30	40	50	60	70
Distance (m)	0	8	16	24	32	40	48	56

Speed = 8 ÷ 10 = 0.8 m/s
Distance at 50 s = 0.8 × 50 = 40 m

Question 8

A car covers 60 km in the first hour, 70 km in the second hour, and 50 km in the third hour. Is the motion uniform? Justify your answer. Find the average speed of the car.

• Not uniform (different distances each hour)
• Total distance = 180 km
• Time = 3 h
• Average speed = 180 ÷ 3 = 60 km/h

Question 9

Which type of motion is more common in daily life—uniform or non-uniform? Provide three examples from your experience to support your answer.

• Non-uniform motion is more common
Examples:
1. Walking to school (stop and go)
2. Bus in traffic
3. Cycling around people or obstacles

Question 10

Data for the motion of an object are given in the following table. State whether the speed of the object is uniform or non-uniform. Find the average speed.

Time (s)	0	10	20	30	40	50	60	70	80	90	100
Distance (m)	0	16	30	45	55	65	75	85	95	105	115

• Speed is non-uniform (intervals not equal)
• Total distance = 115 m, Time = 100 s
• Average speed = 115 ÷ 100 = 1.15 m/s

Question 11

A vehicle moves along a straight line and covers a distance of 2 km. In the first 500 m, it moves with a speed of 10 m/s and in the next 500 m, it moves with a speed of 5 m/s. With what speed should it move the remaining distance so that the journey is complete in 200 s? What is the average speed of the vehicle for the entire journey?

• Total distance = 2 km = 2000 m
• First 500 m: time = 500 ÷ 10 = 50 s
• Next 500 m: time =