Question

5 A train of mass 1.5 X 105 kg is travelling at 40 ms-' when the brakes are applied and it decelerates steadily. The train travels a distance of 250 m before coming to a halt. (a) Calculate the deceleration of the train. (b) Find the average braking force.​

Answer 1

a)3.2m/s^2

b) -480,000N

Step-by-step explanation:

mass of train= 150,000kg

velocity of train=40m/s

acceleration is negative

v^2=u^2-2as

v=0m/s

u=40m/s

s=250m

0=1600-500a

500a=1600

deceleration of 3.2m/s^2

newton's second law

F=ma

F= (150,000× -3.2)

F= -480,000N