Question

A lorry of mass 3000kg traveling at a constant velocity of 72km/h collides with a stationary vehicle of mass 600kg. The impact takes 1.5sec before the two move together at a constant velocity for 15sec . calculate the distance moved after impact

Answer 1

First, we can calculate the initial momentum of the lorry:

Initial momentum of lorry = mass * velocity
Initial momentum of lorry = 3000kg * 72km/h = 216000kg km/h

Since the stationary vehicle has no initial velocity, its initial momentum is 0.

The total momentum before the collision is equal to the total momentum after the collision:

(3000kg * 72km/h) + (600kg * 0) = (3000kg + 600kg) * V

216000kg km/h = 3600kg * V
V = 60 km/h

Now, we can calculate the distance moved after the impact by the lorry and the stationary vehicle:

Distance = velocity * time
Distance = 60km/h * 15sec = 900 meters

Therefore, the distance moved after the impact is 900 meters.