1. ## Energy Problem

A cart in roller coaster is at a height of 80m above ground,and has initial speed of 15m/s and mass of 1200kg. Determine the speed of the cart at the top of the first loop if the loop is 40m.

2. Originally Posted by Hellooo
A cart in roller coaster is at a height of 80m above ground,and has initial speed of 15m/s and mass of 1200kg. Determine the speed of the cart at the top of the first loop if the loop is 40m.

no picture?

at what height is the top of the first loop relative to the ground?

3. sorry, ill try to post a picture >.<

here it is =]]

it's 80m not 80n, my bad.

4. conservation of energy ...

$mgh_0 + \frac{1}{2}mv_0^2 = mgh_f + \frac{1}{2}mv_f^2$

solve for $v_f$

5. so vf=31.8m/s?

Thanks for the quick replies =))