Question

The specialty of an athlete on the women's track team is the pole vault. She has a mass of 44 kg and her approach speed is 8.7 m/s. When she is directly above the bar, her speed is 1.7 m/s. Neglecting air resistance and any energy absorbed by the pole, determine the amount she has raised herself as she crosses the bar.
m

A roller coaster car is pulled up the first (biggest) hill, 103 meters above the subsequent bottom of the hill. Assuming there's no friction, how fast will the car be moving when it reaches the bottom?

How fast is it moving at the top of a following loop-the-loop, which is 69 meters high?

Answer 1

2 나-나 hf (8-1)- (I7) 28 2x 9.& h = 3.114 u