A kid throws a rock down at 5 m/s off a 98 m high bridge. How fast is the rock traveling when it hits the water below?

Why does the input force have to be greater than the force needed to lift the bale?

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

Abeam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. if the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? the value of q = -1.6 × 10-19 coulombs.