| Physics questions on Energy- Please help!?
A 50.0kg parachutis falls at a speed of 47.00m/s when the parachute opens. The parachutist's speed upon?
landing is 5.00m/s. How much work is done by the air to reduce the parachutist's speed?
A 1.0X10^3kg sports car is initially traveling at 15m/s. The driver then applies the brakes for several seconds so that -25kj of net work is done on the car. Calculate the initial and final kinetic energy of the car.
A student slides a .75kg textbook across a table, and it comes to rest after traveling 1.2m. Given that the coefficient of kinetic friction between the book and the table is .34, use the work-kinetic energy theoren to find the book's initial speed. | 
03-16-2008, 08:26 AM
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