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?

Question

Coleman Hardin

Physics

25 May, 08:24

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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Answers (1)

Know the Answer?

Yair Johns · Answer 1

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