Physics

Problem

A constant horizontal force

F

acts on a block of mass

m

that is already moving with speed

v_{0}

. After the block has travelled a further distance

s

in the direction of the force, which of the following gives its speed

v

? a)

v = v_{0} + \sqrt{\dfrac{2 F s}{m}}

v = \sqrt{\,v_{0}^{2} + \dfrac{F s}{m}}

v = \sqrt{\,v_{0}^{2} + \dfrac{2 F s}{m}}

v = \sqrt{\,v_{0}^{2} + \dfrac{F s}{2 m}}