You observe three carts moving to the left. Cart A moves to the left at nearly constant speed. Cart B moves to the left, gradually speeding up. Cart C moves to the left, gradually slowing down. Which cart or carts, if any, experience a net force to the left?

A. Cart A

B. Cart C

C. Cart B

Answer:C-cart B

Explanation:

Given

Cart A is moving with constant speed so net acceleration is zero of the cart. So there is no force on the cart A

For cart B speed is gradually speeding up, so there is an acceleration on the cart which is the result of force.

We can say that cart B is experiencing a net force towards left.

Cart C is gradually speeding down i. e. cart C is experiencing a declaration.

So a net force towards right must be acting on cart C.

Correct answer is Cart B