Question

a body starting from rest and moving with uniform acceleration,a body has velocity of 2m/s after travelling 10 sec.what will its velocity after travelling 40m?
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Answer 1

Answer:

4 m/s

Explanation:

first case :

v = 2 m/s

u = 0

t = 10 sec.

v = u + at        (first eq. of motion)

=> 2 = 10a

=> a = 1/5 m/s²

second case :

a = 1/5 m/s²

s = 40 m

u = 0

v² - u² = 2as    (third eq. of motion)

=> v = √2as

=> v = √2 x 1/5 x 40

=> v =√16 = 4 m/s

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