First slide

Kinetic energy

Question

The kinetic energy of a body of mass 4 kg and momentum 6 N-s will be

Easy

A

4.5J
B

2.5J
C

5.5J
D

3.5J

Solution

Given, m = 4 kg, p = 6 N-s
We know that, kinetic energy of a body,
$K = \frac{p^{2}}{2 m}, K = \frac{(6)^{2}}{2 \times 4} \Rightarrow K = \frac{36}{2 \times 4} = 4.5$

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