A roller coaster of mass 250kg has a speed of v12ms at, Physics

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A roller coaster of mass 250kg has a speed of v12ms at

A roller coaster of mass 250kg has a speed of v=12m/s at point a, located at a height h=15m. The car can move without friction actiong between points a and b.

a) Find speed of car when it reaches point B. Use energy ideas

b) Once past point B, the car feels a friction force of 2000N. How far does the car travel before coming to rest?

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