A body covers 100 cm in first 2 seconds and 128 cm in the next four seconds moving with constant acceleration. Find the velocity of the body at the end of 8 sec ?

A body covers 100 cm in first 2 seconds and 128 cm in the next four se

1.	A body covers 100 cm in first 2 seconds and 128 cm in the next four seconds moving with constant acceleration. Find the velocity of the body at the end of 8 sec ?
Answer» SOLUTION :In first 2 sec. `100=2u+1/2, a.4…….(1)` In first 6 seconds : `228=6u+1/2a. 36 to (2)` `(1) xx 3-(2) " GIVES "72=-12a` `a=-6 cm//s^(2) ……(3)` `2u=112u=56cm//s…….(4)` Now velocity of the body at the end of 8 sec is `V=u+at=56-6xx8` V=8cm/s