A 45.72 kg cyclist going downhill starts from a height of 12.5 m and reaches a velocity of 19 m/s at the bottom. What was the initial velocity of the cyclist?​

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force