Question

 A body moves from rest with a uniform acceleration and travels 540 m in 3 sec .Find the velocity of the body at 20 sec after start .


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Answer 1

Answer:

velocity = 600 m/s

Explanation:

u = 0 -- initial velocity

s = 540 m --- distance

time = 3sec

velocity = displacement/ time

= 540 / 3

= 180 m/ s

v² - u² = 2as

v² - 0 = 2 (a) (540)

180 × 180/ 2 × 540 = a

a = 30 m/s

acceleration of the body is 30 m/s.

2) v =?

u = 0

time = 20 sec

acceleration= 30

v = u + at

v = 0 + 30 (20)

v = 600 m/s