Question

A packet of weight W was allowed to fall freely in a water tank with acceleration 'a' (<g). The magnitude
of resistance force offered by water is?​

Answer 1

if a packet of weight W is allowed to fall in a water such that it accelerates downward with acceleration a then the force applied by the water to oppose its motion is vertically upward and the weight W downvids which is given in the diagram above . on solving the free body diagrams you can get Wa/g = W- F and hand on rearranging the equation you can get the answer F=W(1- a/g) (W/g is mass of packet )

Answer 2

Answer:

option c

Explanation:

as the resistive force is acted in the upward direction against " g" its negative