Question

A car C moving with a speed of 65 km h–1 on a straight road is ahead of motorcycle M moving with the speed of 80 km h–1 in the same direction. What is the velocity of M relative to A?

Answer 1

A car C moving with a speed of 65km/h on a straight road is ahead of motorcycle M moving with the speed of 80 km/h in the same direction.

let $V_C$ velocity of car with respect to ground and $V_M$ is velocity of motorcycle with respect to ground.

i.e., $V_M$ = 80km/h and $V_C$ = 65 km/h

so, velocity of M relative to C , $V_{MC}=V_M-V_C$

= 80 km/h - 65km/h

= 15km/h

hence, velocity of motorcycle relative to car is 15 km/h