A ball is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy when its reaches the maximum height?

1. Kinetic energy is double
2. Kinetic energy is zero
3. Kinetic energy is maximum at maximum height
4. Kinetic energy is half of initial value

When a is thrown vertically upwards. Its velocity goes on decreasing. And at the peak point, its velocity becomes zero.

And we know kinetic energy $K=\frac{1}{2}mv^2$

Here $m\rightarrow$mass of the body

$v\rightarrow$velocity of the body

If at the peak, its velocity becomes zero. Then, $v=0$

Therefore, $K=\frac{1}{2}m(0)^2=0$

Thus, its kinetic energy becomes zero and gets converted into potential energy when the velocity becomes zero at the maximum point.

Therefore, b is correct.