Question

# A 3.00-kg block starts from rest at the top of an incline at height yo = 2.50 m above the floor. It slides down the friction less incline onto the

floor, and then encounters a rough part of the floor that has a coefficient of kinetic friction ug = 0.500. It slides 2.00 m across this surface before the floor is again friction less. It then slides up another frictionless incline on the other side. (There are four situations here, labeled "0" through “3".) 1. What is the initial gravitational potential energy PE, of the block? (Use the floor asthe reference point where PE = 2. What is the speed v, of the block just before it reaches the rough part of the floor? 3. How much work is done by friction on the block as it slides across the rough part?Make sure you get the sign correct. 4. What is the kinetic energy KE2 of the block when it reaches the bottom of the other incline, after the rough floor? 5. How high up the other incline does the block slide before stopping? (Note that this is the height y3, not the distance along the slope.)

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