A roller-coaster car is released from rest at the top of a -high hill

PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy

Problem

500\,\text{kg}

roller-coaster car is released from rest at the top of a

40\,\text{m}

-high hill. The descent is frictionless. Immediately after the bottom, the car travels

60\,\text{m}

along a horizontal track where a constant

200\,\text{N}

kinetic-friction force acts on it. What is the speed of the car at the end of the horizontal section? (a)

28\,\text{m/s}

(b)

23\,\text{m/s}

(c)

27\,\text{m/s}

(d)

29\,\text{m/s}