Question

U= ? , a=5m/s ^2 , s=8.4 m, v^2= 10m/s^2 find u
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Answer 1

Answer:

Explanation:

Hope you got it. And it helps you.

Answer 2

Answer

Initial velocity = 4 m/s

Given

a = 5 m/s²

s = 8.4 m

v = 10 m/s

u = ? m/s

Concept to be used

We need to apply equation's of motion ,

→ v = u + at

→ s = ut + ¹/₂ at²

→ v² - u² = 2as

Solution

Apply 3rd equation of motion ,

$\to\ \rm v^2-u^2=2as\\\\\to\ \rm (10)^2-u^2=2(5)(8.4)\\\\\to\ \rm 100-84=u^2\\\\\to\ \rm u^2=16\\\\\to\ \rm u=4\ m/s$

So , Initial velocity , u = 4 m/s