Question

A roller coaster is at the top of a 72 m hill and weighs 134 kg. The coaster (at this
moment) has gravitational potential energy. Calculate it.

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has kinetic energy. Calculate it.

Answer 1

Answer:

potential energy = mgh = 134 × 9.8 × 72 = 94550.4 J

Explanation:

p E = mgh = 134×9.8 ×72= 94550.4 J

k.E = 1/2m v ×v= .5 ×2.1 × 30 ×30 =945 J

Answer 2

Answer:

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