Question

A loaded grocery cart is rolling across a parking lot in a
strong wind. You apply a constant force F = (30 N) î - (40 N) j to the cart as it undergoes a displacement s = (-9.0 m) î - (3.0 m)j. How much
work does the force you apply on the grocery cart?​

Answer 1

Answer:

Explanation:

Work = Force x displacement ( cross product)

Work is defined only if displacement is in the direction of force applied.

Since force applied in +ve x direction and displacement in -ve x direction, work done is zero

On the other hand force in -ve y direction is -40 N and displacement is in -ve y direction ie -3m, work done = 40×3 = 120