Question

Two  people  push  a  car  for  3  s  with  a  combined  net  force  of 200  N.  
(a)  Calculate  the  impulse  provided  to  the  car.
(b)  If the  car  has  a  mass  of  1200  kg,  what  will  be  its  change  in  velocity?


SCERT Class 9 Telangana, Physical Science Ch 3 Laws of Motion

Answer 1

Given :
Force= 200N
time =3 sec
mass=m=1200kg

Impulse = J= ?

Formula to be used : Impulse = Fx t
=200 x 3 = 600 Ns

B) Impulse J= m ΔV
⇒ ΔV= J/m
⇒600 Ns/1200 kg
=0.5 m/s

Therefor Impulse J is 600Ns
and change in velocity is 0.5m/s.

Answer 2

heya...

Here is your answer...

Given,

Net force = 200 N

Time taken = 3 seconds

a) Impulse provided by the car = Force × Time

= 200 × 3

= 600 N.s

b) Given,

Mass of the car = 1200 kg

Change in velocity = 600 N.s/1200kg

= 0.5 m/s

It may help you....☺☺