Question

3) a car of mass 2000kg is moving with speed of 108 km/hr. Calculate the momentum of the car. Calculate the required to stop the car with in distance of 20m.​

Answer 1

Answer:

777600 kg m/s

Explanation:

Momentum(p) = Mass x Velocity

So, p=2000 x $\frac{1944}{5}$ (convert the velocity to meter/second)

p= 777600 kg m/s

final velocity = 0

initial velocity = 1944/5

displacement = 20

form v=u+at,

a=-1944/5t

s=ut+$\frac{1}{2} at^{2}$

20=1944t/5-972t/5

20=972t/5

t=100/972 sec