Question

A moving body of mass 20kg has 40joulesof kinetic energy calculate its speed

Answer 1

Ek= ½ m v²
40= ½ 20 v²
40= 10 v²
v² = 40/10 = 4
v =√4 = 2 m/s

Answer 2

We know that

Kinetic energy=1/2mv^2

40=1/2*20*v^2

40=10v^2

V^2=4

V=2m/s

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