A 57.0 kg pole vaulter running at 9.00 m/s vaults over the bar.

The acceleration of gravity is 9.81 m/s
I got 4.28 and I don't know what i did wrong

2

.

If the vaulter’s horizontal component of velocity over the bar is 1.7 m/s and air resistance

is disregarded, how high is the jump?

Answer in units of m.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.