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: Option B
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)