A projectile is sitting on top of a cliff that is 250m above ground. The projectile is launched with a horizontal speed of 25m/s

(a) How far from the base of the cliff did the projectile “land?”

(b) What is the vertical speed of the projectile when it lands [just before it hits
the ground]?

(c) How long did it take the projectile to reach the ground?

Which of the following is an example of units for speed

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

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.