Question

a body starts from rest moving with an acceleration a=2m/s for some time and agter achieving a max velocity starts retarding at the rate of 4m/s^2 and finally comes to rest and if the total time taken is 30sec then max velocity attained is

Answer 1

at first
u is 0
therefore v is equal to at which becomes 2t at a is given 2
so t becomes v/2
now for second
v is 0 and u is v that's final velocity or max velocity of previous
so as v=u+ at
so 0=v+4t
so t=v./4 as it can't be negative
add both time and put it equal to 30
the answer is 40m/s

Answer 2

Ans12

Explanation:

t(xy)/x+y

t=10s

x=2 m/s

y=3m/s

10(2x3)/2+3

= 60/5

= 12 mls