A baseball player throws a baseball of mass 0.22 kg at a speed of 35 m/s and initial angle of 25 degrees. Ignoring air friction, what is the kinetic energy of the baseball at the highest point of the trajectory?

Two blocks are free to slide along the frictionless wooden track as shown in the figure.  The block of mass m1 = 5 kg is released from rest from the position shown, at height h = 5.00 meters above the flat part of the track.  At the bottom of the track rests mass m2 = 10 kg.   No work is done by non-conservative forces     a.What is the speed of block m1 just as it reaches but before it collides with block m2 (use Cons. Of Energy)?   b.What is the velocity of m1 just after it collides elastically with m2 (use Conservation of Momentum)?            and what is the velocity of m2 just after it collides elastically with m1 (use Conservation of Momentum)?   c. How far back up the ramp does m1 rise after the collision (use Cons. Of Energy?) and also find that if an 7 kg block, m3, that lies to the right of m2, is moving toward m2 (after m2’s collision with m1) at a speed of 26.8 mph (conversion!), what is the velocity of the m2/m3 couple after they collide in a perfectly inelastic collision…

A man of mass 79.5 kg walks down the aisle of an airplane at a speed of 1.50 m/s in the forward direction while the plane moves at a speed of 325 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane.(b) Find the man's kinetic energy relative to the earth.

A rocket is attached to the back of a train engine which pushes the engine along a curvy track with an applied force of 1,000 Newtons. The engine has a mass of 500 kg. The total length of track is 800 meters. Starting from rest, what will be the train's speed at the end of the track? (You must use energy methods for credit on this problem not kinematics.)