A particle began to move at \(27 ms^{-1}\) along a straight line with constant retardation...
FURTHER MATHEMATICS
WAEC 2023
A particle began to move at \(27 ms^{-1}\) along a straight line with constant retardation of \(9 ms^{-2}\). Calculate the time it took the particle to come to a stop.
- A. 3 sec
- B. 2 sec
- C. 4 sec
- D. 1 sec
Correct Answer: A. 3 sec
Explanation
\(u = 27 ms^{-1}; a = -9 ms^{-2}; v = 0; t = ?\)
\(v = u + at; t = \frac{v - u}{a}\)
\(t = \frac{0 - 27}{-9} = \frac{-27}{-9}\)
\(\therefore t = 3 sec\)
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