A student pushes a laptop cart down the hallway by applying 20 Newtons force. The student pushes it 10 meters and then stops at the water fountain with the cart and haves a sip of water. While he drinks from the water fountain, what
type of work is being done to the laptop cart.

None.

Explanation:

        causes an object to change its position, i.e. to have a displacement.

        Since the laptop cart is at rest while he stops at the water fountain, no  

       net work done is on the laptop cart.

b) phosphorus pentoxide

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i just did this and got a 100.