steering Physics: Problems from Chapter 2-Google Chrome ecure i https://session.

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steering Physics: Problems from Chapter 2-Google Chrome ecure i https://session.masteringphysics.com/r offset-next Y 166, Introductory Physics, Part I blems from Chapter 2 Problem 2.46 roblem 2.46 Part A Astone is thrown vertically upward with a speed of 21.0 m/s How fast is it moving when it is at a height of 13 0m Express your answer to three significant figures and include the appropriate units. Submit My Answers Give up Part B w much tme is rea i ed reach his height? Enter your answers to three significant figures separated by a comma Submit

Explanation / Answer

a) Ke at bottom = KE at top +PE

0.5mv1^2 = 0.5mv2^2 + mgh

21^2/2 = v2^2 / 2 + 9.8*13

v2 = 13.64 m/s

b) v= u + gt

21 = 13.64 + 9.8 t

t = 0.75 s

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