A ball has an initial speed of 5 m/s, going to the right then hits a wall. After hitting the wall, the ball now goes to the left with a speed of 2 m/s. What is the magnitude of the force exerted by the wall to the ball if the time of contact between the two is 0.02 s? Hint: Be careful with the direction of the velocities.
A ball has an initial speed of 5 m/s, going to the right then hits a wall. After hitting the wall, the ball now goes to the left with a speed of 2 m/s. What is the magnitude of the force exerted by the wall to the ball if the time of contact between the two is 0.02 s? Hint: Be careful with the direction of the velocities.
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Transcribed Image Text:1.a. A ball has an initial speed of 5 m/s, going to the right then hits a wall. After hitting the wall, the ball now
goes to the left with a speed of 2 m/s. What is the magnitude of the force exerted by the wall to the ball if
the time of contact between the two is 0.02 s? Hint: Be careful with the direction of the velocities.
1.b. A boxer punches a 60-kg bag, with the speed of fist at 8 m/s. After the punch, the bag flies away and the
hand comes to a complete stop. What is the rebound velocity and kinetic energy of the bag? Assume that
the moving part of the hand weighs 5 kg.
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