Asked by G

A 1500kg car moving at a speed of 20 m/s comes to a halt. How much work was done by the brakes?

How fast can a 2.0 horsepower motor lift a 200 kg mass?

A boy with a mass of 20 kg is riding on a 10 kg cart which is travelling at 3 m/s. He jumps off in such a way that he lands on the ground with no horizontal speed. What was the change of speed of the cart?

not sure how to solve please help

Answers

Answered by Henry
1. Work = 0.5M*V^2 = 0.5*1500*20^2 =
300,000 J.

2. hp * 746W/hp = 1492 Watts=1492J/s.

P = F*V = Mg * V = 1492 J/s.
200*9.8 * V = 1492
1960V = 1492
V = 0.76 m/s.


Answered by G
thank you for the help
Answered by Henry
Glad I could help.
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