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)

Answer this Question

Related Questions

physics - A body of mass 6kg, initially moving with speed 12m/s, experiences a ...
physics - A body of mass 6kg, initially moving with speed 12m/s, experiences a ...
physics - A body of mass 6kg, initially moving with speed 12m/s, experiences a ...
physics - A body of mass 6kg, initially moving with speed 12m/s, experiences a ...
physics - A body of mass 6kg, initially moving with speed 12m/s, experiences a ...
Algebra - While traveling in a car, the centrifugal force a passenger ...
Physics - A net force of 75 lbs acts on a body of mass 25 slugs which is ...
physics - A car that weighs 1.5 × 10^4 N is initially moving at a speed of...
Physics - A car of mass 1200kg starts from rest, accelerates uniformly to a ...
physical science - Which of the following four bodies has the greatest kinetic...

For Further Reading

First Name:
School Subject:
Answer: