A block initially at rest slides on a frictionless horizontal surface

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

1.0\,\text{kg}

block initially at rest slides on a frictionless horizontal surface. A constant horizontal force of

6.0\,\text{N}

is applied to the back of the block. The block’s front face is attached to a horizontal spring of force constant

50\,\text{N/m}

that is fixed to a wall. The block is

0.40\,\text{m}

from the wall when the force begins and has moved

0.30\,\text{m}

when the spring has been compressed by

0.10\,\text{m}

. What is the block’s speed at that instant? (a)

2.9\,\text{m/s}

(b)

1.8\,\text{m/s}

(c)

1.5\,\text{m/s}

(d)

1.9\,\text{m/s}