Question

You serve a volleyball with a mass of 2 kg. The ball leaves your hand with a speed of 30 m/s. The ball has kinetic energy. Calculate it.

Answer 1

Answer is given in the pic.

Answer 2

Answer:

The ball has 900 kinetic energy

Explanation:

formulas for kinetic energy = $Ke = 0.5 X m X v^{2}$

KE = 0.5

m = 2kg

$Vx^{2} = 30m/s^{2}$

$KE = 0.5 X 2kg X 30m/s^{2} \\KE = 1kg X 30m/s^{2} \\\\KE = 30m/s^{2} \\\\KE = 900$