Question

A 2800 kg truck moving at 12 m/s to the right hits a stopped 1100 kg car. What is the combined velocity the moment they stick together?

Answer 1

The combined velocity is 8.61 m/s.

Step-by-step explanation:

Given that,

The mass of a truck, m = 2800 kg

Initial speed of truck, u = 12 m/s

The mass of a car, m' = 1100 kg

Initial speed of the car, u' = 0

We need to find the combined velocity the moment they stick together. Let it is V. Using the conservation of momentum.

`m_1v_1+m_2v_2=(m_1+m_2)V\\\\V=(m_1v_1+m_2v_2)/((m_1+m_2))\\\\V=(2800* 12+0)/(2800+1100)\\\\V=8.61\ m/s`

So, the combined velocity is 8.61 m/s.