Question

A body starts with initial velocity 20 m/s and undergoes a uniform retardation of 2m/s^2. Find the
displacement of body at time t = 16s.
(a)64m
(b)44m
(c)74m
(d)none of these​

Answer 1

Answer:

x=ut+1/2at'2 that's formulas apply then

x=20*16-1/2*2*256=320-256=64m

answer is 64m option a

Answer 2

LET'S APPLY SECOND EQ OF MOTION:-

$s=ut1/2at^2$

$s=20*16-16^2\\s=320-256\\s=64$

hence opt-a is correct answer