Question

A force produces an acceleration of 5.0 cm $s^{-2}$ when it acts on a body of mass 20 g. Find the force acting on the body.

• A. $1\times {10}^{-3}N$
• B. $2\times {10}^{-3}N$
• C. $4\times {10}^{-3}N$
• D. $5\times {10}^{-3}N$

Answer 1

The correct option is A $1\times {10}^{-3}N$

$F=ma=20\times {10}^{-3}\times 5\times {10}^{-2}={10}^{-3}N$