Question

A ball of mass 0.1kg is thrown vertically upwards with an initial velocityof 80 m/s. calculate the pontential energy (i) half way up (ii) at its maximum height. what is its kinetic energy as it leaves the ground​.​

Answer 1

The kinetic energy as it leaves the ground​:

$$K=0.5mv^2=0.5(0.1)(80)^2=320\ J$$

i)

$$E=0.5K=0.5(320)=160\ J$$

ii)

$$E=K=320\ J$$