Physics
posted by Ellie .
Two 30kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80m tall hill and they are traveling at 30 km h1 when they reach the bottom. (The cart had brakes!) How much work was done on the cart by friction during its travel down the hill? (Note: the use of the word on and remember to specify the sign of the work done.)

Physics 
Amina
plese help me to answer this proplem
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