Q1: A 64 kg volleyball player leaps 70 cm in the air to spike the ball. What is

Question

Q1: A 64 kg volleyball player leaps 70 cm in the air to spike the ball. What is her Gravitational Potential Energy at her max height? Don't forget to convert 70 cm to meters!

Q2: We have done a lot of up and down kinetic energy, and finding the speed if something falls from a certain height. Let's go in the x-direction (horizontally). We are going to look at a .175 kg hockey puck. A hockey puck is slapped by a stick and leaves the stick at 100 mph. What is the kinetic energy of the puck upon leaving the stick?

Explanation / Answer

1)

Gravitational potential energy, PE = mgh = 64 x 9.8 x 0.7 = 439.04 J

2)

Velocity, v = 100 mph = 44.70 m/s

Kinetic energy, KE = 0.5 mv^2 = 0.5 x 0.175 x 44.70^2 = 174.83 J

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