The average speed of a bicycle, an athlete and a car are 18 km/hr, 7 m/s and 2 km/min respectively. Which among these is the fastest and the slowest one?

Answer 1

Convert all speeds to the same units and than compare them.

For the bicycle, 18 km/h
= 18000 m/3600 s
= 5.0 m/s

For the car 2 km /min
= 2000 m/60 s = 33.3 m/s

The athlete runs at 7 m/s. The bike is slowest and the car is fastest in this case.

Answer 2

Car fast and bike slow

Answer 3

Draw d-t graph for the following situation (a) when body is stationary (b) when body is moving with uniform velocity (c) when body is moving with variable velocity and uniform acceleration