Question

If an object is moving in a straight line with acceleration of 8m/s . If it's final velocity is 10m/s after covering the distance of 4m in specific time . Find its initial velocity

Answer 1

Answer:

v²=u²+2aS

10²=u²+2×8×4

100=u²+64

u²=100-64

   =36

u=√36

 =6

initial velocity of body is 6 m/s

there is no necessity of finding time here.

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Answer 2

Answer:

u = 20 m/s

Explanation:

a = 8m/s²       &      v = 10 m/s          &   s = 4m

u = ?

2as = v²- u²

2 x 10 x 4 = 10² - u

80 -100 = - u

u = 20 m/s