Mattymatts3380 Mattymatts3380

14-01-2020
Physics

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56 J of work was done to increase the kinetic energy of a 1.90 kg mass. If the object’s initial velocity was zero, what is its speed now?

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ohiekulous ohiekulous

14-01-2020

Answer:

7.68 m/s

Explanation:

Ek = 56 J

m = 1.90 kg

u = 0

v = ?

Ek = 0.5m(v - u)²

56 = 0.5×1.90×(v -0)²

56 = 0.5×1.90v²

56 = 0.95v²

v² = 56/0.95 = 58.95

v =√58.95

v = 7.68 m/s

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