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Phy 121
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A ball rolls off the end of an incline with a vertical velocity of 20 cm/s downward, and a horizontal velocity of 80 cm/s. The ball falls freely to the floor 120 cm below.
• For the interval between the end of the ramp and the floor, what are the ball's initial velocity, displacement and acceleration in the vertical direction?
Acceleration is 980 cm/s^2. Initial velocity is 0 cm/s. Displacement is 120 cm.
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• What therefore are its final velocity, displacement, change in velocity and average velocity in the vertical direction?
Final Velocity is 484.97 cm/s. Displacement is 120 cm. Change in velocity is 484.97 cm/s. Average velocity is 242.49 cm/s.
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• What are the ball's acceleration and initial velocity in the horizontal direction, and what is the change in clock time, during this interval?
The initial velocity is 80 cm/s. The change in clock time is ???? The acceleration is ??????
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• What therefore are its displacement, final velocity, average velocity and change in velocity in the horizontal direction during this interval?
The final velocity is 0 cm/s. The change in velocity is -80 cm/s. The average velocity is 40cm/s. The displacement is ?????
The ball does not come to rest in the horizontal direction while falling; while falling its horizontal velocity remains unchanged
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• After the instant of impact with the floor, can we expect that the ball will be uniformly accelerated?
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• Why does this analysis stop at the instant of impact with the floor?
The analysis stops when the ball hits the floor because it is the end of the vertical displacement.
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Unknown
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