The skater is has a mass of 75 kg. find the total potential energy of the skater at the top of the ramp at 6 m.

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -