A skateboarder moves with speed relative to a moving walkway

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

A skateboarder moves with speed

v_{S/W}

relative to a moving walkway, which itself moves with speed

v_{W/F}

relative to the airport floor. Using standard subscript notation (object/reference), which expression correctly gives the skateboarder’s speed

v_{S/F}

relative to the floor? (a)

v_{S/F}=v_{S/W}+v_{W/F}

(b)

v_{S/F}=v_{S/W}-v_{W/F}

(c)

v_{S/F}=\dfrac{v_{S/W}+v_{W/F}}{2}

(d)

v_{S/F}=v_{S/W}\,v_{W/F}