Question

a body of mass 10kg initially at rest is subjected to force of 40N. what is the kinetic energy acquired by the body at the end of 10second​

Answer 1

Answer:

The kinetic energy acquired by the body at the end of 10s is 2000 Joules.

Explanation:

Given:

• Mass of the body, m = 10kg.
• Force acting on a body, F = 20N.
• Body is initially at rest, u = 0.

To Find:

The kinetic energy acquired by the body at the end of 10 sec.

Solution:

To find the Kinetic energy (KE) = ?

First we need to find the final speed of the body.

Using equation of motion,

V = u + at

=> V = u + at

=> V = at ------- {As F = ma}

=> V = 20×10/10

=> V = 200/10

=> V = 20 m/s.

Therefore,

Final speed of the body is 20 m/s.

Now,

KInetic energy (KE) acquired by the body at the end of 10 sec,

KE = 1/2 mv²

=> KE = 1/2 mv²

=> KE = 1/2 × 10 × (20)²

=> KE = 5 × (20)²

=> KE = 5 × 400

=> KE = 2000 J.

Therefore,

The kinetic energy acquired by the body at the end of 10 sec is 2000 Joules.