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 common velocity

Answer 1

First, let's convert the velocities to m/s:
Initial velocity of the lorry = 72 km/h = 20 m/s
Final common velocity = v m/s

Using the principle of conservation of momentum:
Initial momentum = final momentum

(3000kg * 20m/s) + (600kg * 0) = (3600kg * v)

60000 + 0 = 3600v

v = 60000 / 3600
v = 16.67 m/s

Therefore, the common velocity after the collision is 16.67 m/s.