Question

A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).

Options

• 3

• 9

• 12

• 18

Answer 1

9

Explanation:

Force, F = `"dm"/"dt""v"`

= `10/5xx4.5`

= 9 dyne.