Question

A packet of weight W was allowed to fall freely in a water tank with acceleration ‘a’ ( of resistance force offered by water is
A)$wg/a$
(B)$wa/g$
(C)$w[1-(a/g)]$
(D)$w[1+(a/g)]$

Answer 1

when the weight is allowed to fall downwards it

a ccelerates in downward direction hence the water exerts force on it in the opposite direction

$f = w - \frac{wa}{g} = w(1 - \frac{a}{g} )$

I HOPE THIS HELPS ( ╹▽╹ )

Answer 2

option d is correct dued !!...