GRADE 12 PHYSICS UNIVERSITY LEVEL. Spent 2 hours thinking about part b

label Physics
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1.  Rob throws a baseball upwards at 14.2 m/s.  His friend, John, is sitting in a tree 4.5m above Rob.

a.  Calculate how long it will take to reach John.

b.  If John misses the ball as it moves upwards, how long will it take to reach John again.

Oct 3rd, 2015

Thank you for the opportunity to help you with your question!

v^2 = u^2 -2 • a • d

0^2=14.2^2- 2 x a x 4.5

0 = 201.64-9a

9a=201.64

a= 22.4 m/s^2

time taken to reach 4.5m

t= u/a

=14.2/22.4

=0.63 sec

time of flight 

T=2t

=2x0.63

=1.268 sec



Please let me know if you need any clarification. I'm always happy to answer your questions. rate my answer please.
Sep 21st, 2015

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Oct 3rd, 2015
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Oct 3rd, 2015
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