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April 20, 2014

Homework Help: physic

Posted by intan on Sunday, March 14, 2010 at 11:03am.

A long jumper's take-off velocity is 10 m/s at an angle of 20o to the horizontal. His centre
of gravity is 1 m above the ground at take-off and is 0.5 m above the ground at landing.
a)How far does he displace his centre of gravity horizontally between take-off and landing?
b) Is this the optimal angle of take-off? If not, what would the approximate optimal angle be
(no calculation necessary)? Given that this velocity vector is typical of world class long
jumpers, why do they not increase their angle of take-off? [4]

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