Can someone help me with physics??

Question

Three uniform spheres of mass m1 = 1.50 kg, m3 = 4.00 kg, and m2 = 7.50 kg are placed at the corners of a right triangle. Where the distance from m1 to m3 is 3.00m in y-direction and the distance from m2 to m3 is -4.00m in x direction. Calculate the resultant gravitational force on the 4.00 kg object, assuming the spheres are isolated from the rest of the Universe.
a) What are i N + j N?

Answer 1

the equation is F=(Gmm)/r^2. (G is a constant always equal to 6.67x10^-11)
first find the m1 and m3 one.
F=((6.67x10^-11)(1.5)(4))/3^2
F=4.45x10^-11N
then the m3 and m2 one
F=((6.67x10^-11)(4)(7.5))/4^2
F=1.25x10^-10N
then just do pathagorean theorem to get the resultant as 1.33x10^-10N
not that much!