A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball.

Open in App

Solution

Change in kinetic energy $= \frac{1}{2} m v^{2} - \frac{1}{2} m u^{2} = \frac{1}{2} m (v^{2} - u^{2}) = \frac{1}{2} \times 0.5 (3^{2} - 5^{2}) = - 4 J$

The minus sign shows that there is a decrease in KE.

Suggest Corrections

Similar questions

(a) Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.

(b) What is the difference between potential energy and kinetic energy?

(c) A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.

Q. A ball of mass