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A 15.0kg box at rest has 250.J of work done on it. How fast is it going?

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

 A 15.0kg box slides down an incline of height 5 m. If the box starts from rest at the top of the incline and has 270J of kinetic energy at the bottom, determine the work done by friction 

Engineers are designing a system by which a falling mass m impartskinetic energy to a rotating uniform drum to which it is attachedby thin, very light wire wrapped around the rim of the drum. Thereis no appreciable friction in the axle of the drum, and everythingstarts from rest. This system is being tested on earth, but it isto be used on Mars, where the acceleration due to gravity is3.71m/s^2. In the earth tests, when m is set to 15.0kg and allowedto fall through 5.00m, it gives 250.0J of kinetic energy to thedrum.
a) If the system is operated on Mars, through what distance wouldthe 15.0-0 mass have to fall to give the same amount of kineticenergy to the drum?
b) How fast would the 15.0kg mass be moving on Mars just as thedrum gained 250.0J of kinetic energy?

Two blocks with different masses are attached to either end of alight rope that passes over a light, frictionless pulley that issuspended from the ceiling. The masses are released from rest, andthe more massive one starts to descend. After this block hasdescended 1.20m, its speed is 3.00m/s. If the total mass of the twoblocks is 15.0kg, what is the mass of each block?

I need to answer this using work/energy and not kinematics.

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