The Grinch is trying to push a 5000-kg sled up the side of Mount Crumpit (whose side make an angle of 60 degrees above the horizontal) when he suddenly loses his grip and lets go of the sled. The sled starts sliding back down and soon afterwards hits a tree with an impact speed of 60 m/s, three hundred meters further down the slope.

Find the amount of gravitational potential energy that has been lost during the slide (in J).

How much kinetic energy has the sled gained during the slide?

The force responsible for the overall loss of mechanical energy is

A. normal force
B. weight
C. static friction
D. kinetic friction

The missing mechanical energy has been

A. lost for good
B. turned to kinetic energy
C. turned to potential energy
D. turned to thermal energy

Aball is thrown upward. at a height of 10 meters above the ground, the ball has a potential energy of 50 joules (with the potential energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 joules. what is the maximum height h reached by the ball? consider air friction to be negligible. 1. h ≈ 10 m 2. h ≈ 50 m 3. h ≈ 30 m 4. h ≈ 40 m 5. h ≈ 20 m 003 10.0 points which of the two object shown below has the greatest kinetic energy? a m b 1 2 m v 2v 1. kinetic energies are the same. 2. a 3. b 4. unable to determine. 004 10.0 points tim, with mass 74.6 kg, climbs a gymnasium rope a distance of 3.1 m. the acceleration of gravity is 9.8 m/s 2 . how much potential energy does tim gain? answer in units of j. 005 10.0 points a car is moving at 64 miles per hour. the kinetic energy of that car is 5 × 105 j. how much energy does the same car have when it moves at 111 miles per hour? answer in units of j. 006 10.0 points an 102 kg man climbs up a 1 m high flight of stairs. the acceleration of gravity is 9.81 m/s 2 . w