Question

a body having initial velocity 10m/s is moving with an acceleration of 2m/s2 find displacement of body.? (1) in the 5th second of motion. (2) in 5 second?​

Answer 1

Explanation:

hope it helps...

Good luck

Answer 2

Answer:

(1) 19m

(2) 75m

(actually it's better to do (2) first coz the answer in (2) is used in (1))

Explanation:

$s = ut + \frac{1}{2}at^{2}$

(2)

Displacement in the 5 seconds

$= ut + \frac{1}{2} at^{2} \\\\= (10)(5) + \frac{1}{2} (2)(5)^{2} \\\\= 75m$

(1)

Displacement in the 5th second

= Displacement in 5 seconds - Displacement in 4 seconds

$= 75 - [(10)(4) + \frac{1}{2} (2)(4)^{2} ]\\\\= 75 - 56\\\\= 19m$