A roller-coaster car shown in the figure below is pulled up to point 1 where it

Question

A roller-coaster car shown in the figure below is pulled up to point 1 where it is released from rest. Take y = 39 m . (Figure 1)

Part A

Assuming no friction, calculate the speed at point 2.

Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the speed at point 3.

Express your answer to two significant figures and include the appropriate units.

Part C

Calculate the speed at point 4.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

The heights below the top of1:

j2 = 39 m

j3 = 39 - 26 = 20 m

j4 = 39 - 14 = 32 m

For each of the answers use

V = (2*g*j)

Part A

V = (2*9.81*45)

V = 29.69m/s

Part B

V = (2*9.81*20)

V = 19.79m/s

Part C

V = (2*9.81*32)

V = 25.04m/s

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