Question

A body of mass 5 kg initially at rest is subjected to a force of 20 N. What is the kinetic energy acquired by the body at the end of 10 s?

a. 500 J
b. 100 J
c. 200 J
d. 50 J

Answer 1

The kinetic energy acquired by the body at the end of 10 s is 40 J.

Step-by-step explanation:

The formula to calculate the kinetic energy of an object is KE = 0.5 * mass * velocity squared. The kinetic energy acquired by the body at the end of 10 s is 40 J.

Given that the mass of the body is 5 kg and it is subjected to a force of 20 N, we need to calculate the final velocity of the body using the equation F = ma.

Since the body is initially at rest, the initial velocity is 0. Plugging in the values, we find that the final velocity is 4 m/s.

Now, we can calculate the kinetic energy using the formula KE = 0.5 * mass * velocity squared. Plugging in the values, we get KE = 0.5 * 5 kg * (4 m/s)^2 = 40 J.

Therefore, the kinetic energy acquired by the body at the end of 10 s is 40 J.