Question

Starting from a stationary position, Anil paddles his bicycle to attain a velocity of 10 m s
-1
in
25 s. Then, he applies brakes such that he again comes to rest after next 50 s.
Calculate the acceleration of the bicycle in both cases.
Also find the total distance covered by Ani

Answer 1

Answer:

acc & distance in 1st case :

given t = 25sec , u = 0m/s , v = 10m/s

from 1st equation of motion ,

v = u + at

=> 10 = 0 + a(25)

=> a = 10/25 = 0.4m/s^2

from 2nd equation of motion ,

v^2 - u^2 = 2as

=> 100 = 2(0.4)(s)

=> 100/0.8 = s

=> s = 125m

acc & distance in 2nd case :

the final velocity in 1st case becomes initial velocity in 2nd case so

u = 10m/s , t = 50sec , v = 0m/s

from 1st equation of motion ,

v = u + at

=> 0 = 10 + a(50)

=> -10 = 50a

=> a = -10/50 = -0.2m/s^2

here acc is negative because it indicates its direction which is opposite to direction of motion

by second equation of motion,

v^2 - u^2 = 2as

=> 0^2 - 10^2 = 2(-0.2)(s)

=> -100 = -0.4s

=> s = 100/0.4 = 250m

∴total distance covered in both cases is 250 + 125 = 375m

hope it helps u !!!!!

plzzz mark me as brainliest .....