Question

[42]
A body of mass m starting from rest is acted on a force
producing a velocity
v=VkXs
wehre k is constant and s is displacement. The work done
by the force t second is
O mºt2/8
O mkt/4
O mkt/8
O mºk’t/4
​

Answer 1

option 2 is the answer but I don't want sure