Question

2. A balloon has 2 g of air. A small hole is pierced into
it. The air comes out with a velocity of
4 m/s. If the balloon shrinks completely in 2.5 s.
The average force acting on the balloon is
(1) 0.008 N
(2) 0.0032 N
(3) 8 N
(4) 3.2 N​

Answer 1

Answer:

2) 0.0032

Explanation:

force = mass*accln

= 0.002*(4-0)/2.5

= 0.008/2.5 = 0.0032 N

Answer 2

Explanation:

F=mass×acceleration

velocity=initial velocity + acceleration× time

Then v=0,u=4,t=2.5s

v=u+at

0=4+a2.5

solve equation

then multiply it by mass