Person's acceleration and object's acceleration

[pebbles]

Homework Statement

A man with mass 80 kg exerts force of 150 N on 500 kg object. What is his acceleration and what is the acceleration of the object? (assume no external forces)

Homework Equations

a=f/m

The Attempt at a Solution

not sure how to calculate the acceleration of object, but would i calculate the acceleration of the man like this--> a=150 N/80 kg...?

 

[thylow]

Draw a Free body diagram. Mass of man, force horizontal on the 500kg object. With every action there is an equal and opposite reaction. When the forces have been solved and equal to each other. Solve the acceleration using a = 150 N/500kg for the acceleration of the object. The acceleration of the man is right what you put down. Just make sure you have it in the right direction

I'll answer other questions on my website listed in my profile.

 

[pebbles]

accel. for object, would i put a negative sign in front of the answer since it's a problem dealing with Newton's third law..?

 

[thylow]

Well yea.. but draw your coordinate system in your Free body diagram. so that your teacher knows.