%20a sics Momentum Conservation Law and Collisions Internet Explorer 87231620 m

Question

%20a sics Momentum Conservation Law and Collisions Internet Explorer 87231620 m 6.48 previous 1 6 of 18 nexd Part A Use the impulse-momenturn theorem to find the time it takes a ball falling from a tall building to double its speed from 55 m/s to 11 m/s (Ignore air resistance ) Express your answer to two significant figures and include the appropriate units. 1 Value Units Submit My Answers Give UR Part B Use a kinematic equation to calculate the same amount of time Express your answer to two significant figures and include the appropriate units. alueT Submit My Auswers Give Up Provide Feedback Continue to

Explanation / Answer

a) impulse = change in momentum

m v - m v0 = m g t

t = (v - v0) / g

= (11 - 5.5) / 9.8

t = 0.561 s

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Using kinematic equation vf = vi + a t

t =  vf - vi / a = 11 - 5.5 / 9.8

t = 0.561 s

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