If the speed of an object triples how does this affect its kinetic energy

a man drops a ball downside from the roof of a tower of height 400 meters. At the same time another ball is thrown upside with a velocity 50 m/s from the surface of the tower, find when and at which height from the surface of the tower the two balls

a marine biologist wants to know the total vertical distance a dolphin travel during a jump with the surface of the water being zero is started underwater at - 35 ft jump up and out of the water the 27 ft and return to the water to swim at - 18 feet

A rock with a mass of 2.9 kg falls 5.5 m. What potential energy does it have before the fall?

What isn't a charecteristic of the part of the atom A?

Explain why astronomers have deduced that galaxies contain a large quantity of dark matter

A father racing his son has 1/3 the kinetic energy of the son, who has 1/2 the mass of the father. The father speeds up by 1.4 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

A 2 kg book is pushed across a table is a force 4. Assuming no friction, what is the acceleration of the book?

When electricians use wiring for houses they use both copper and rubber. Which do you think is used as a conductor?

Suppose that 600 W of radiation in a microwave oven is absorbed by 250 g of water in a very lightweight cup. Approximately how long will it take to heat the water from 20 C to 80 C? (A) 50 s (B) 100 s (C) 150 s (D) 200 s

Calculate the velocity of a 1650kg satellite that is in a circular orbit of 4.2 x 10^6m above the surface of a planet which has a radius 3.95 x 10^5 m and the period of the orbit is 2.0 hours.