A projectile is fired from flat, level ground with an unknown initial velocity. The projectile reaches a maximum height of 20 meters and lands a horizontal distance of 45 meters from where it was launched. Find the time of flight for the projectile.
Find the x component of the initial velocity.
Find the initial speed of a projectile.
Find the angle at which the projectile was launched.

Acar is traveling at 53.0 mi/h on a horizontal highway. (a) if the coefficient of static friction between road and tires on a rainy day is 0.104, what is the minimum distance in which the car will stop?

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?