A2 kg ball has 100 j worth of gpe. how high must it be above the ground? a. 5 m b. 20 m c. 2 m d. 10 m

28. a stone is projected at a cliff of height h with an initial speed of 42.0 mls directed at angle θ0 = 60.0° above the horizontal. the stone strikes at a, 5.50 s after launching. find (a) the height h of the cliff, (b) the speed of the stone just before impact at a, and (c) the maximum height h reached above the grou

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer