Question

The K.E of a body is 1000j if it's movementum decreases by 50% then 1/ K.E of body becomes

What will be answer?
(a) 500j (c) 250j
(b) 750j (d)1250j

Answer 1

Answer:

250 J

Explanation:

Since

K-E = P²/2m (K-E ∝ P²)

As P Goes from 1 to 0.5 (From 100% to 50%)

Hence New K.E Will Be :

K-E = (0.5)²

K-E = 0.25

Let's say initial K-E was 1 ( 100%)

so decrease in K-E is 1 - 0.25 = 0.75 or 75%.

since we're given with kinetic energy = 1000J

so if we'll Decrease This 1000J by 75 %.

Of course we gonna get 250J.

Which is your Answer .