A block of mass 250g is kept on a vertical spring of spring constant 100N/m fixed from below. The spring is now compressed to have a length 10cm shorter than its natural length and the system is released from this position. How high does the block rise? take `g=10 m/s^2`.

Answer

B, C

Explanation

`m=250g=0.25kg, k=100N/m`
`x=10cm`
`=0.1m`
`g=10 m/sec^2,h=?`
Applying law of energy
`1/2kx^2=mg`
`rarr h=1/2((kx^2)/(mg))`
`=(100xx0.01)/(2x(0.250)xx10)`
0.2m=20cm`