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May 23, 2013

# Homework Help: physics

Posted by nerd on Monday, January 10, 2011 at 5:54pm.

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.

• physics - Damon, Monday, January 10, 2011 at 5:58pm

F*time = change in momentum
10*3 = 6 (12-v2)
30 -72 = -6 v2
42/6 = v2 = 7m/s

KE = (1/2) 6 (49)

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