Physics

Problem

2.0\,\text{kg}

cart is moving leftward at

2.0\,\text{m/s}

while a horizontal force of

15\,\text{N}

pushes it to the right. What is the instantaneous power delivered to the cart by the force at that moment? a)

-30\,\text{W}

+30\,\text{W}

-7.5\,\text{W}

-15\,\text{W}