Physics Problem

Question

I need help. I dont understand this. Can anyone help me on this plz. AS soon as possible. Thank YOU, this would be really appreciated alot for real. bye. Bye

A 50 kg roller coaster pauses at the top of a 7 m hill, then accelerates down the hill, reaching a top speed of 30 m/s when it reaches the bottom.

1. Identify the energy transfer.

1. Organize the data.

m (kg)	g (m/s2)	hi (m)	hf (m)	vi (m/s)	vf (m/s)
50		7			30

1. CALCULATE the energy the roller coaster starts with. SHOW WORK!

Answer 1

This is a weird problem. They say that the RC pauses at the top of the 7 meter hill. That means v_i = 0 and the initial potential energy = total energy can be calculated as mgh = (50kg)(9.8 m/s²)(7 m) = J

The final height can be obtained by E_T - E_Kf =E_Pf - mgh_f and solve for h_f (with E_Kf = 1/2 m v_f²)