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A skateboarder weighing 1245 grams travels down hill at a rate of 367.5 centimeters in 3 seconds. What is the skateboarder's kinetic energy?


A roller coaster cart travels to the top of the track with a PE of 125.7 J and descends to the bottom of the largest hill with a KE of 89.5 J. What is the mechanical energy of the roller coaster?


A golf ball weighing 86.4 grams is dropped from a height of 1.15 meters. What is the gravitational potential energy, GPE, of the golf ball before it is dropped?

Sagot :

Sommeray

Answer:

1. 89.5J

2. 215.25J

3. 0.975J

Explanation:

1. 0.5mv^2 = Ke

2.pe+ke=me

3. mgh = gpe

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