A man pushes a truck initially at rest and weighting $2.5$ tonne along a horizontal rail with a steady force of $200 N$. The resistance to the motion amounts to $30 N$ per tonne. The velocity of the truck at the end of 30 seconds is

Question

$$(a)\;1.5 m/s \quad (b)\;0.15 m/s \quad (c)\;15 m/s \quad(d)\;150 m/s$$