physics
posted by Samantha .
When you lift a bowling ball with a force of 69.3 N, the ball accelerates upward with an acceleration a. If you lift with a force of 77.2 N, the ball's acceleration is 2.00a. Calculate the weight of the bowling ball.
For this should I add both force together to find a?

Use F=ma.
69.3mg = ma
77.2mg = 2ma
Eliminate a from the equation and solve for m. g=acc.due to gravity = 9.8 m/s/s.