Homework Help: physics

Posted by Alyssa on Wednesday, December 1, 2010 at 11:46am.

A 250 kg car starting from rest is pushed 30m. When the car reaches 30m, it’s traveling at a speed of 12m/s and it encounters 52N of friction. What is the acceleration of the car and what is the force of the push on the car?

physics - drwls, Wednesday, December 1, 2010 at 12:26pm
During the period it is accelerating without friction, V = sqrt(2 a X)

Solve for acceleration a.

The pushing force during that time is
F = m a

You have not made it clear at what time you want to know the acceleration, Is it before or after friction is applied?

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