A force of $20 N$ act on a body whose weight is $9.8 N$ . What is the mass of the body and how much is its acceleration. $(g = 9.8 m / s^{2})$ ?

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Solution

Force $F = 20$ N
weight $= m g = 9.8$ N
Mass $= m$
$m g = 9.8$
therefore $m = 1$ kg
acceleration $= a$
$F = m a$
$20 = 1 a$
therefore $a = 20 m / s^{2}$

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