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Question

What is the momentum in kg. m/s of a 10 kg car travelling at (a) 5 m/s (b) 20 cm/s, and (c) 36 km/h?

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Solution

(a) 5 m/s
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 5 m/s
Putting these values in the above formula, we get:
Momentum = 10 × 5 kg.m/s
= 50 kg.m/s

(b) 20 cm/s
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 20 cm/s
v = 0.2 m/s
Putting these values in the above formula, we get:
Momentum = (10)(0.2) kg.m/s
= 2 kg.m/s

(c) 36 km/h
We know that:
Momentum = mass × velocity
= m × v
Here, mass, m = 10 kg
velocity, v = 36 km/h
=36×10003600=36×10003600=36×1036=10 m/s
Putting these values in the above formula, we get:
Momentum = 10 × 10 kg.m/s = 100 kg.m/s

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