Physics

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}

23\,\text{m/s}

27\,\text{m/s}

29\,\text{m/s}