Question

27. A ball is thrown up in the air. Halfway to its maximal height, what is the net force acting on the ball? Assume that there is no air resistance a. The net force is 0 N. b. The net force is less than its weight. c. The net force is greater than its weight. d. The net force is equal to its weight. 28. Two identical spheres are resting on a horizontal surface at a distance of 0.01 m from cach other, each attached to an identical unstretched spring with a spring constant of 100 N/m. If we charge the spheres with a negative charge of -1.60 HC each, what is the compression of each spring? Coulomb's constant is k 9.0 x 109 N m/c2 a. 0.14 m b. 0.18 m c. 0.32 m d. 0.36 m

Answer 1

27.) At Halfway of maximum height , ball tends to move upward .Hence net force on ball at that point is greater than weight of ball.