Physics 163

Unit 4: Momentum and Collisions

Problem Set A

Problem 10:

A 1.9 kg object is thrown upward with an initial speed of 9 m/s. The ball is caught when it has a downward speed of 9 m/s. How long (in seconds) was the ball in the air? (Hint: use the weight of the ball as the force and use 9.8 m/s/s for acceleration due to gravity.)

• Read the problem carefully and diagram the physical situation
• Identify known and unknown information in an organized manner
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Momentum and collision principles can be reviewed on the Set A Overview page.

Further information about the impulse-momentum change equation is available online at The Physics Classroom.

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