there were 5 seconds left in a basketball game. In order to run out the clock a player threw the ball directly up as hard as he could. How hard would the player have to throw the ball to make sure that it would not land before time expired? Hint: d= -16t + vt+ h

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.