Questions VI The sketch above shows the path of a heavy iron ball thrown by an a

Question

Questions VI The sketch above shows the path of a heavy iron ball thrown by an athlete. The ground is level and the dashed lines are parallel to the ground. Assume that the fric- tional forces acting on the ball are negligible. 5) The speed of the ball at poiht I, when it leaves the hand of the athlete, is the same as its speed at point (A) (B) (C) (D) v (E) VI The potential energy of the ball is greatest at point (A) I (B) II (C) (D) (B) VI 7 Which of the following is a true statement about the acceleration of the ball during its flight? (A) It is greatest at point I. (B) It is greatest at point 11. (C) It is least at point II. (D) It is least at point V (E) It is the same at all points.

Explanation / Answer

5)

at all the points the sum of the potential and kinetic energy has to be same. we can see that point I and V are at same height and hence have same potential energy. hence the kinetic energy at I and V are also same . so they have same speed at I and V

D) V

6)

C) III

The potential energy is maximum when the kinetic energy is minimum. the speed is minimum at the heighest point at III. hence the potential energy is maximum at III since kinetic energy is minimum there

7)

The ball moves under acceleration due to gravity all the time which remain same .

E)

1)

d = distance moved

F = resisting force = 6 N

KEi = initial KE = 24 J

KEf = final KE = 0 J  

using work-change in KE theorem

- F d = KEf - KEi

- 6 d = 0 - 24

d = 4 m

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