Question

Calculate the momentum of the following : (a) an elephant of mass 2000 kg moving at 5 m/s (b) a bullet of mass 0.02 kg moving at 400 m/s with explanation

Answer 1

EXPLANATION.

• GIVEN

TO FIND THE MOMENTUM.

a) = an elephant of mass 2000kg moving at 5 m/s

As we know that,

MOMENTUM = MASS X VELOCITY

mass = 2000 kg

velocity = 5 m/s

put the value in given equation,

we get,

momentum = 2000 X 5 = 10000 kg. m/s

b) = a bullet of mass 0.02 kg moving at 400 m/s

As we know that,

MOMENTUM = MASS X VELOCITY

mass = 0.02 kg

velocity = 400 m/s

put the value in given equation,

we get,

momentum = 0.02 X 400 = 8 kg. m/s

Answer 2

LINEAR MOMENTUM

The product of mass and velocity is called linear momentum

Momentum = Mass × Velocity

It is denoted by " P "

The SI unit of momentum is kg•m/s

A)

Given ,

Mass (m) = 2000 kg

Velocity (v) = 5 m/s

Thus ,

P = 2000 × 5 = 10000 kg•m/s

$\sf \therefore \underline{The \: momentum \: of \: elephant \: is \: 10000 \: kg.m/s}$

B)

Given ,

Mass (m) = 0.02 kg

Velocity (v) = 400 m/s

Thus ,

P = 0.02 × 400 = 8 kg•m/s

$\sf \therefore \underline{The \: momentum \: of \: bullet \: is \: 8 \: kg.m/s}$