Question

A 4kg block on a friction less table
is attached to a horizontal spring
with k = 400N/m .The spring is
initially compressed by 5cm. Find
the work done on the block by the
spring as the block moves from
5cm to equilibrium position?
1) 2.5 J
2) 0.5 J
3) 1.5 J
4) 10 J

aravShrivastava thanks
but the key answer is given as 0.5


​

Answer 1

the answer is 0.5

Explanation:

use the formula -1/2 kx^2

Answer 2

Answer:

The answer of these question is (1)2.5J