Question

a force of 20 n upon a body whose weight is 9.8 n . what is the mass of the body and how much is it's acceleration(g=9.8m/s

Answer 1

Weight = Mass × Acceleration due to gravity
9.8 = m × 9.8
m = 1 kg

By Newton's second law of motion,
$force = \frac{change \: in \: momentum}{time} \\ f = \frac{mv - mu}{t} \\ f = m \times ( \frac{v - u}{t} ) \\f = m \times a \\ 20 = 1 \times a \\ a = 20 \: m {s}^{ - 2}$

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