Question

If you throw a 0.6kg ball straight up with an initial speed of 33 m/s, how much kinetic energy will it have as you release it? Round your answer to the nearest whole number and include the appropriate unit.

Answer 1

Given:

The mass of the ball, m=0.6 kg

The initial speed of the ball, u=33 m/s

To find:

The kinetic energy of the ball when it was released.

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. The kinetic energy is directly proportional to the square of the velocity of the objects.

Thus the initial kinetic energy of the ball is,

$E=\frac{1}{2}mu^2$

On substituting the known values,

$\begin{gathered} E=\frac{1}{2}\times0.6\times33^2 \\ =326.7\text{ J} \\ \approx327\text{ J} \end{gathered}$

Final answer:

The kinetic energy of the ball when it is released is 327 J