1.A ball of mass 1.5kg is thrown upward.It leaves the throwershand with a veloci

Question

1.A ball of mass 1.5kg is thrown upward.It leaves the throwershand with a velocity of 10m/s. the following questions refer to themotion after the ball leaves the throwers hand.Assume that theupward diretion is ositive.Show all calculatins please.

a. How long does it take for the ball to return to the throwershand?

b. What is the final velocity of the ball just before it reachesthe hand?

c. What is the change in momentum of the ball?

d. What is the impulse calculated from the change inmomentum?

e. what is the average force acing on the ball?

2. After the ball in question 1 hits the throwers hand, it comesto rest in a time of 0.25s.

a. What is the net impulse exerted on the ball?

b. What is the average force exerted by the hand on theball?(hint: Dont forget the gravitational force).

Explanation / Answer

the mass of the ball is m = 1.5 kg the initial velocity of the ball is u = 10 m/s a)   long does it take for the ball to returnto the throwers hand = time of flyght = 2u / g =2.040 s b) the final velocity of the ball just before it reaches thehand = -initial velocity v =- 10 m/s c) the change in momentum is = final momentum - initialmomentum                                              = - mv - mu                                              = - 30 kg m/s d ) impulse = change in momentum / timetaken =- 14.7 N e ) the force is due to the gravitation = mg = 1.5 kg *9.8 m/s2 = 14.7 N 2 ) time taken t = 0.25 s    initial velocity v = 10 m/s final velocity= 0 m/s     impulse = change in momentum / timetaken                = 60 N

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