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Alika [10]
3 years ago
8

A ball is rolling a 5 m/s down a hill the ball has 20 J of energy what is the mass of the ball

Physics
1 answer:
Dmitriy789 [7]3 years ago
7 0

Its 1.6 kg

Remember

E = 1/2mv^2 is the kinetic energy of the ball. The energy is given to you so you need to solve for mass. Rearranging the equation gives you 2E/v^2 = 1.6

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A heavy ball with a weight of 150 N is hung from the ceiling of a lecture hall on a 4.1-m-long rope. The ball is pulled to one s
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First find the mass of rod,

mg = 150                          ( g = 9.8 \frac{m}{s^{2} } )

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  T = mg + \frac{mv^{2} }{r}

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