Thread: Motion

A car travelling with a constant speed of 80 km/h passes a stationary motorcyle policeman. The policeman sets off in pursuit, accelerating to 80 km/h in 10.0 s and reaching a constant speed of 100km/h after a further 5.0 s. At what time will the policeman catch up with the car?

Originally Posted by Joker37

A car travelling with a constant speed of 80 km/h passes a stationary motorcyle policeman. The policeman sets off in pursuit, accelerating to 80 km/h in 10.0 s and reaching a constant speed of 100km/h after a further 5.0 s. At what time will the policeman catch up with the car?

On the same set of axes, draw the velocity-time graphs for the car and the motorbike. Then find the time at which the area under each is equal.

Originally Posted by mr fantastic

On the same set of axes, draw the velocity-time graphs for the car and the motorbike. Then find the time at which the area under each is equal.

Awww...isn't there an easier way?