Football coaches advise players to block, hit, and tackle with their feet on the ground rather than by leaping through the air. Using the concepts of momentum, work, and energy, explain how a football player can be more effective with his feet on the ground.

Doing some physics homework and am kind of stumped here!

It is a sunny day, and we have decided to do lab outside instead of staying cooped up. Ceylani goes to the top of Jordan Hall, and throws a ball of mass 4.87 kg down from the top of Jordan which is 124 m tall. Her lab partner, Tray, is waiting at the bottom to collect the ball and return it, for more data trials. The ball has a speed of 3.8 m/s when Ceylani throws it straight down. What is the speed of the ball as it reaches the ground? Your Answer: units Answer

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…

Mr. M is holding his daughter. As he puts her down to the ground, he is doing negative work, True or False

A father racing his son has 1/2 the kinetic energy of the son, who has 1/2 the mass of the father. The father speeds up by 1.8 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son?

Tarzan crosses a gorge by swinging in an arc from a hanging vine. This is a process of  Choose the answer A) momentum conservation b) energy conservation c) both energy and momentum conservation d) neither energy nor momentum conservation