Homework Help: PHYSICS

Posted by Kate on Tuesday, June 21, 2011 at 7:50pm.

A 900 kg car pushes a 1900 kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4800 N.
(a) What is the magnitude of the force of the car on the truck?
(b) What is the magnitude of the force of the truck on the car?

PHYSICS - Damon, Tuesday, June 21, 2011 at 7:55pm
F = m a
4800 = (900+1900) a
a = 4800/2800 = 1.714 m/s^2

a)
F = m a
F = (1900)(1.714)
= 3257 Newtons

b)
negative 3257 Newtons (action and reaction)

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