Description
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.
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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
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Visit the website and write a brief report on research that strikes you as interesting - it must be about Neanderthals.
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