3. A child slides down a slide and has 450 J of kinetic energy at the bottom of the slide. If all this energy was gravitational potential energy at the top of the slide and her mass is 49 kg, how tall is the slide?

Height of slide = 0.936 m

Explanation:

Gravitational potential = Mass x Acceleration due to gravity x Height

P. E = mgh

Mass, m = 49 kg

Acceleration due to gravity, g = 9.81 m/s²

Height, h = ?

Potential energy, P. E = 450 J

Substituting

P. E = mgh

450 = 49 x 9.81 x h

h = 0.936 m

Height of slide = 0.936 m