A a big bad Viewpoint tennis player strikes a little cute fuzzy tennis ball. The ball leaves the racket horizontally at 28.4 m/s. The ball hits the level ground a horizontal distance 20.0 m from start. How far above the ground is the fuzzy little tennis ball when it starts?

Aspecial electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. the sensor measures the magnitude of the normal force that the seat exerts on a rider. the loop-the-loop ride is in the vertical plane and its radius is 23 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 740 n. at the top of the loop, the rider is upside down and moving, and the sensor reads 370 n. what is the speed of the rider at the top of the loop?

Energy is the ability to do work which measures what

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?