Question

A body has kinetic energy 250 J. if the mass of the body is 5kg, then choose its velocity and momentum from the following options:

a. 50 m/s
b. 50 kg m/s
c. 20 kg m/s
d. 15 m/s
e. 10 m/s​

Answer 1

Given:

A body has kinetic energy 250 J. The mass of the body is 5kg.

To find:

Momentum of object?

Calculation:

General expression relating KE , momentum and mass is :

$KE = \dfrac{ {P}^{2} }{2m}$

$\implies {P}^{2} = KE \times 2m$

$\implies {P}^{2} = 250 \times 2 \times 5$

$\implies {P}^{2} = 2500$

$\implies P = \sqrt{ 2500}$

$\implies P = 50 \: kg \: m {s}^{ - 1}$

So, momentum of object is 50 kg m/s

Answer 2

Answer:

50 kg m/s

Explanation:

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