Question

A body of mass 0.5 kg is moving at a constant velocity of 2ms^-1 to bring it to rest in 2m the work done is
a) 0.5 J
b) 1.0 J
c) 2.0 J
d) 4.0J
​

Answer 1

Answer:

(b) work done W = 1.0 J

Explanation:

Given

mass m = 0.5kg

velocity v = 2 m/s

distance s = 2 m

work done W = ??

Solution

As we know that

work = K.E

we can write

W = 1/2 mv²

W = 1/2 (0.5 kg) (2 m/s)²

W = 1/2 X 0.5 X 4

W = 1 J

Answer 2

Answer:

Explanation:

According to law of conservation, Work Done = Change in kinetic Energy

⇒W=ΔK.E

w= 1/2 m v^2

  = 1/2 0.5 * 2^2

1 J

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