Question

A body of mass 1 kg is suspended from massless
spring of natural length 1 m. If mass is released
from rest, spring stretches upto a vertical
distance of 40 cm, the potential energy stored in
the spring at this extension is (g = 10 m/s2)
(1) 2 J
(2) 8J
(3) 6J
(4) 4J​

Answer 1

Answer:

Potential energy stored will be 4 J

So option (4) will be the correct option

Explanation:

We have given that mass of the body m = 1 kg

It is given that spring is stretches by 40 cm

So h = 0.4 m

Acceleration due to gravity is given as $g=10m/sec^2$

We have top find the potential energy

We know that potential energy is given by

$PE=mgh=1\times 10\times 0.4=4J$

So option (4) will be the correct answer