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(2) When a ball rises verticallv to a height h and returns to its original point

ID: 1283815 • Letter: #

Question

(2) When a ball rises verticallv to a height h and returns to its original point of projection, the work done by the gravitational force is (a) 0. (b) -mgh. (c) +mgh. (d) -2mgh e) +2mgh (3) A car rounds an unbanked curve of radius rat constant speed v. The required centripetal force is provided by (a) the weight of the car (b) the normal force exerted on the car (c) the force of kinetic friction between the tires and the road (d) the force of static friction between tires and road (e) the passengers in the car

Explanation / Answer

2) Zero(net displacemennt is 0)

3) b

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