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Could someone please help me with this problem?

1. The problem statement, all variables and given/known data

A 145kg object and a 445kg object are separated by .420m.

a. Find the net gravitational force exerted by these objects on a 41.0kg object placed midway between them.

b. At what position can the 41.0kg object be placed so as to experience a net force of zero?

2. Relevant equations

F=Gm1m2/r^2

3. The attempt at a solution

(6.67X10^-11Nm^2/kg)(145kg)(41.0kg)/.420^2=-2.2X10^-6

(6.67X10^-11Nm^2/kg)(445kg)(4)/.420^2=6.7X10^-7

-2.2X10^-6+6.67X10^-7=2.87X10^-6

Thank you very much

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# Homework Help: A net gravitational problem

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