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
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Answer 1

Answer:

Given that,

Weight of packet = W

Acceleration = a

We know that,

Resistance force is

When a packet fall freely in a water then the force mg will applied downward and resistance force will applied upward.

We need to calculate the magnitude of resistance force offered by water

Using balance equation

Where, W = weight of packet

= resistance force

m = mass of packet

a = acceleration

Put the value of mass

Hence, the magnitude of resistance force offered by water is

(c) is correct option.