Question

A white go-kart moving 5 m/s hits a red go-kart that is at rest. Both go-karts weigh 2 kilograms and the

white go-kart travels in the opposite direction at 2 m/s after the collision. What is the velocity of the red
go-kart after the collision?
A 10 m/s
7 m/s
5 m/s
o 2 m/s

Answer 1

The velocity of the red go-kart after the collision is 3 m/s

Step-by-step explanation:

Here the principle of conservation of momentum will be used.

Momentum of the system before collision = Momentum of the system after collision

Momentum of the system before collision
`= 2*5 + 2*0`

Momentum of the system after collision
`= 2 * 2 + 2 *x`

`2*5 + 2*0`
`= 2 * 2 + 2 *x`

`10-4 = 2 x\\6 = 2x\\x = 3`m/s

The velocity of the red go-kart after the collision is 3 m/s