Question

9.A train starting from rest, picks up a speed of 20 m/s in 200 s. It continues to
move at the same speed for the next 500 s. It is then brought to rest in the next
100 s. (i) Plot a speed time graph. (ii) Calculate the rate of uniform acceleration.
(iii) Calculate the rate of uniform retardation. (iv) Calculate the distance covered
by the train during retardation. (v) Calculate the average speed during
retardation​

Answer 1

calculate the volume of O2 required for combustion of 11.2 litre butane the percentage purity of o2 is 60 percentage?

Charge on 1 electron= 1.6x10^-19 C

So, in 1 coulomb of charge 1/(1.6x10^-19)

= 6.25x10^18 ...