The mass of the cart is 3.0kg. Now two forces are applied to the cart with two different spring scales as shown below. The spring scale FA reads 10.5N.
The cart now moves toward the right with an acceleration toward the right of 2.5m/s2. What does spring scale FB read?1
Fb - Fa = ma
=> Fb -10.5 = 3*2.5
=> Fb = 18 N