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Newton's Laws for System of Particles

A particle of...

Question

A particle of mass $5$ kg starts from rest with an acceleration of $a = 1 m / s^{2}$ . Find kinetic energy after 1 second.

A

2.5 J

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B

5 J

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C

7.5 J

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D

10 J

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Solution

The correct option is B $2.5 J$
$v = a t = 1 m / s$ for $1 s$
$K E = 0.5 m v^{2}$
$K E = 0.5 (5) (1)^{2}$
$K E = 2.5 J$

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