Question

A car of mass 200 kg is moving with an initial velocity of 20 m/s and after t seconds the final velocity of the car becomes 40 m/s. Calculate the change in momentum of the car. *

Answer 1

Answer:

mass(m)= 2400 kg,       initial velocity(u)- 20m/s,   final velocity(v) =0     time taken(t)= 10s         retardation= ?     force=?

we can say thar retardation is negative acceleration

(i)by using first equation of motion,we get

v=u +at

0= 20+aX10

0= 20+10a

-20 = 10a

-20/10= a

-2= a

thus, retardation= 2m/s2

(ii) f= ma

f= 2400 X (-2)

= -4800N

Step-by-step explanation:

Answer 2

Step-by-step explanation:

A car of mass 200 kg is moving with an initial velocity of 20 m/s and after t seconds the final velocity of the car becomes 40 m/s. Calculate the change in momentum of the car. *