A body accelerates uniformly from rest at 2\(ms^{-2}\). Calculate its velocity when it has travelled...
PHYSICS
WAEC 2017
A body accelerates uniformly from rest at 2\(ms^{-2}\). Calculate its velocity when it has travelled a distance of 9m.
- A. 3.0\(ms^{-1}\)
- B. 4.5\(ms^{-1}\)
- C. 6.0\(ms^{-1}\)
- D. 18.0\(ms^{-1}\)
Correct Answer: C. 6.0\(ms^{-1}\)
Explanation
Given that \(u = 0ms^{-1}, a = 2ms^{-2}, s = 9m\)
We can use the equation, \(v^{2}=u^{2} +2as\) so that we have,
\(v^{2} = 0^{2} + 2\times 2\times 9\)
\(v^{2} = 36; v= 6.0ms^{-1}\)
Note; u = Initial velocity
v = final velocity
a = acceleration
s = distance covered
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