A body of mass 28g, initially at rest is acted upon by a force, F...
FURTHER MATHEMATICS
WAEC 2018
A body of mass 28g, initially at rest is acted upon by a force, F Newtons. If it attains a velocity of \(5.4ms^{-1}\) in 18 seconds, find the value of F.
- A. 0.0082N
- B. 0.0084N
- C. 0.082N
- D. 0.084N
Correct Answer: B. 0.0084N
Explanation
\(F = mass \times acceleration\) but \(accl = \frac{v - u}{t}\)
\(\therefore F = m(\frac{v - u}{t})\)
\(Mass = 28g = 0.028kg\)
\(v = 5.4 ms^{-1}; u = 0; t = 18secs\)
\(\therefore F = 0.028(\frac{5.4 - 0}{18}) = 0.028 \times 0.3 = 0.0084N\)
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