Question

A 2,000 kg truck moving from 10 m/s collides with a car parked on traffic lights. After the collision, the two move together at a speed of 8 m/s. The car's mass is

Answer 1

Answer: mass of the car will be 500kg.

Explanation:

Answer 2

The mass of the car is 500 kg.

Explanation:

It is given that,

Mass of the truck, $m_1=2000\ kg$

Initial speed of the truck, $u_1=10\ m/s$

It collides with the parked car, $u_2=0$

Final speed of both the objects after the collision, V = 8 m/s

Let $m_2$ is the mass of the car. It can be calculated using conservation of linear momentum. It is given by :

$m_1u_1+m_2u_2=(m_1+m_2)V$

$2000\times 10=(2000+m_2)8$

$2500=(2000+m_2)$

$m_2=500\ kg$

So, the mass of the car is 500 kg. Hence, this is the required solution.

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