A18 kg rock starting from rest free falls through a distance of 7.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. earth’s mass is 6.0 × 1024 kg. show all your work, assuming the rock-earth system is closed.

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

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static