Question

A boy and his skateboard have a combined mass of 65 kg. What is the speed of the boy and skateboard if they have a momentum of 275 kg • ?

Answer 1

Speed (s) = momentum (M) : mass (m)

s = 275kg * m/sec : 65 kg ≈ 4,23 m/sec

Answer 2

Answer : The velocity is given by 4.2 m/s.

Explanation :

It is given that,

Mass of a boy and the skateboard is, m = 65 kg

The momentum of the combined system is, p = 275 kg m/s

We know that the momentum of a body is the product of its mass and the velocity with which it is moving.

i.e.

$p=m\times v$

or

$v=\dfrac{p}{m}$

$v=\dfrac{275\  kg m/s }{65\  kg}$

$v=4.2\ m/s$

The speed of the boy and the skateboard is 4.2 m/s.