1. A car of mass 1100 kg starts from rest at sea level and climbs a hill of alti

Question

1. A car of mass 1100 kg starts from rest at sea level and climbs a hill of altitude 50 m. At the top of the hill the car has a speed of 25 m/s. From the top of the hill the driver turns off the engine and coasts down to an altitude of 15 m. Assume the friction and the air resistance to be negligibly small. (6 points each, no partial credit; use the back of any page or any space on this page for scratch work, but these will not be graded)

a) The work produced by the engine of the car is ________________________ Joule.

b) The speed of the car when the altitude is 15m is _______________________ m/s

c) After passing the altitude of 15m, the driver climbs up again, without turning the engine on. In this case, the speed of the car would be zero

at an altitude of ______________________ m.

d) In reality the friction and the air resistance are not zero. If the work needed to overcome the friction and the air resistance is 5.2

Explanation / Answer

2)

a)((.06)(225)+(.06)(75))/5= 3.6 )

b)I believe it should be set up as K=(5.060)(a)/.2 but I'm not sure about what acceleration should be. The correct answer is 1620 but I don't know how to get that thanks

c)No energy loss due to friction.

Potential energy of the spring = kinetic energy of the block.

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