A 100 gram apple is released from rest 500 m above the ground. Due to the combined forces of air resistance and gravity, it has a speed of only 40 m/s when it reaches the ground. How much work must have been done on the apple by the force of air resistance?

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.