Homework Help: Physics

Posted by Ray on Wednesday, September 26, 2012 at 4:00pm.

Suppose you throw a 0.058-kg ball with a speed of 11.0 m/s and at an angle of 31.5° above the horizontal from a building 12.3 m high.
(a) What will be its kinetic energy when it hits the ground?

(b) What will be its speed when it hits the ground?

Physics - Scott, Wednesday, September 26, 2012 at 4:34pm
the throwing angle has no effect

the KE at impact is the initial KE plus the KE gained from the gravitational potential (m g h)

KE = (.5 * .058 * 11.0^2) + (.058 * 9.8 * 12.3)

v^2 = (2 * KE) / .058

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