Question 4, chap 6, sect 4. A car is lifted a vertical distance in a service ati

Question

Question 4, chap 6, sect 4. A car is lifted a vertical distance in a service ative to the floor. potential energy would it have? part 1 of 1 10 points station and therefore has potential energy rel- If it were lifted twice as high, how muclh 1. Twice 2. One half 3. Cannot decide 4. Same Question 5, chap 6, sect 8. part l of 1 10 points A rock of mass m is thrown horizontally off a building from a height h. The speed of the rock as it leaves the thrower's hand at the edge of the building is vo, as shown. Tn What is the kinetic energy of the rock just before it hits the ground? 2

Explanation / Answer

Question 4) Potential energy = mgh
if h2 = 2h1
P2 = mgh2 = mg*2h1 = 2P1
correct option is (1)

Question 5)

From conservation of energy
(KE+PE)top =(KE+PE)bottom
0.5mvo^2 +mgh = Kf + 0
Kf = 0.5mvo^2 +mgh
correct option is (1)

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