1. The figure below shows an approximate representation of the contact force ver
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Question
1.
The figure below shows an approximate representation of the contact force versus time during the collision of a 75 g tennis ball with a wall. The initial velocity of the ball is 7.140
The figure below shows an approximate representation of the contact force versus time during the collision of a 75 g tennis ball with a wall. The initial velocity of the ball is 7.140 times 101 m/s, in the positive x direction, perpendicular to the wall. What is the impulse, J, that the wall exerts on the ball? What is the speed of the tennis ball after the collision?Explanation / Answer
1)
impulse = area under the curve
impulse = 0.5*2*10^-3*1200 + (9-2)*10^-3*1200 + 0.5*1*10^-3*1200
impulse = 10.2 N.s
2) impulse = change inmomentum
10.2= m*(v2-v1)
10.2=75*10^-3 *(v2 -(- 71.4)
v2 = (10.2 - 71.3*75*10^-3)/(75*10^-3) = 64.7 ( in the opposite direction)
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