Question

an car of mass 1000 kg carrying passengers weighing 2000 N is moving at 36 kmh ¹ .the momentum of the system of car + passengers is __________kNs (g=10ms²​

Answer 1

Answer:

Given mass of car =1000kg

u=speed=90km/hr=90×  

18

5

​

m/sec

u=25m/sec

it have to stop in 5sec

then final velocity =0

⇒v=u+at

o=25+a×5

=a=−5m/sec  

2

 

then the force applied by break is ma

=1000X−(5m/sec  

2

)

=−5000M

force =5000N by break

distance travelled to stop the car after break is applied (s=distance)

v  

2

=u  

2

+2as

0=(25)  

2

−2×5×s

=s=  

10

(25)  

2

 

​

=62.5m

work done by break =F×s

w=5000×62.5=312.5KJ

Explanation:

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Answer 2

Answer:

The momentum of the system of car + passengers is 10000kgm/s

Explanation:

Total mass(m)= 1000kg

Force(F) = 2000N

Velocity(V) = 36km/hr

The SI unit of velocity is m/s

∴v= 36*5/18=10m/s

We know that,

Momentum is the product of mass and velocity.

∴$p=m*v$

    = 1000*10

   = 10000kgm/s

Therefore, the momentum of the system of car + passengers is 10000kgm/s