Motion and Time — Practice

Question 1

A bus travels 240 km in 4 hours. Find its speed in km/h and m/s.

Accepted Answer

Speed = 240/4 = 60 km/h. In m/s: 60 x 5/18 = 16.67 m/s.

Question 2

Convert 90 km/h to m/s.

Accepted Answer

90 x 5/18 = 25 m/s.

Question 3

A pendulum makes 15 oscillations in 30 seconds. Find its time period.

Accepted Answer

Time period = 30/15 = 2 seconds.

Question 4

Classify as uniform or non-uniform: (a) a train entering a station, (b) the Earth revolving around the Sun, (c) a car at constant speed.

Accepted Answer

(a) Non-uniform motion. (b) Uniform motion (approximately). (c) Uniform motion.

Question 5

How long will a cyclist moving at 15 km/h take to cover 45 km?

Accepted Answer

Time = Distance/Speed = 45/15 = 3 hours.

Practice — Motion and Time