Momentum on an incline

[stargirl17]

Homework Statement

A 20-newton force pulling an object up a hill at a constant rate of 2 m/s. The diagram shows a box that is 5 kg on an incline that is 30 m long and 10 m high.

the answers are
1) 0 kg-m/s
2) 10 kg-m/s
3) 100 kg-m/s
4) 600 kg-m/s

The equation for momentum is p=mv

Homework Equations

The Attempt at a Solution

so wouldn't i just do
(5 Kg)(2 m/s)= 10 kg-m/s

 

[lightgrav]

yes, if the question is "what is the magnitude of the momentum"
... but for "what is the rate of change in momentum", the answer is different .

 

[stargirl17]

yes it was what is the magnitude of the momentum?
thank you :)