Question

A body of mass 4 kg initially at rest is subject to a force of 16 n . what is the kinetic energy acquired by the body at the end of 10 s

Answer 1

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Answer 2

KINETIC ENERGY WILL BE 3200 J.

Given:

• Mass of body = 4 kg
• Force experienced = 16 N

To find:

Kinetic energy at the end of 10 seconds?

Calculation:

Let the acceleration be 'a' :

$a = \dfrac{force}{mass}$

$\implies a = \dfrac{16}{4} = 4 \: m {s}^{ - 2}$

Now, applying EQUATIONS OF KINEMATICS:

$v = u + at$

$\implies \: v = 0 + (4)10$

$\implies \: v =40 \: m {s}^{ - 1}$

Now, we know that:

$KE = \dfrac{1}{2} m {v}^{2}$

$\implies \: KE = \dfrac{1}{2} \times 4 \times {(40)}^{2}$

$\implies \: KE = 3200 \: joule$

So, kinetic energy will be 3200 J.