Q70 of 146 Page 148

A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value for the stone?

A. Its acceleration


B. Its kinetic energy


C. Its potential energy


D. Its weight

Since, as shown in the picture the object at point P will have the maximum height so the kinetic energy will be zero and stone would have the maximum potential energy.

More from this chapter

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68

A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s-2, the work done by her after climbing 2 m will be:

A. 200 J B. 800 J


C. 8000 J D. 2000 J

 69

Which of the following does not possess the ability to do work not because of motion?

A. A sparrow flying in the sky


B. A sparrow moving slowly on the ground


C. A sparrow in the nest on a tree


D. A squirrel going up a tree

 71

A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more: on the truck or on the bicycle? Give a reason to support your answer.

 72

The work done by a force acting obliquely is given by the formula: W = F Cos θ × s. What will happen to the work done if angle between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant?