Use hooke's law to determine the variable force in the spring problem. a force of 5 pounds compresses a 15-inch spring a total of 3 inches. how much work is done in compressing the spring 7 inches

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

The ability to make things happen is also called a. heat b. force c. matter d. energy

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.