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A 30 kg box rests at the top of 30 degree incline before it is released. The top of the incline is 5.0 m above the floor.
a) How fast will it be moving when it reaches the bottom of the ramp if the surface is frictionless?
b) Based on part (b), how fast will the box are moving when it reaches the bottom of the ramp with friction?
c) How much energy will be dissipated if the surface is not frictionless and the kinetic friction fk is 25 N?
A boat moves 15 .0 km across a lake in 30.0 min. What is the average speed of the boat in kilometers per hour
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