Question

What force, acting on a mass of 20 gm initially at rest for 5 sec will (0.004N) impart to it a velocity of 1 m/s ?​

Answer 1

$0.004 \: N$

Explanation:

$Given, \: \: m = 20 \: g = 0.02 \: kg, \: t = 5s \: \: and \\ \: \: v = 1 \: ms^{ - 1} , \: u = 0 \: ms^{ - 1} \\ we \: \: know \: \: \boxed{v = u + at} \\ putting \: \: values \\ 1 = 0 + a \times 5 \\ 1 = a \times 5 \\ a = \frac{1}{5} \: ms^{ - 2} \\ Now, \: \: \: force = m \times a \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 0.02 \: kg \times \frac{1}{5} \: ms^{ - 2} \\ \: \: \: \: \: = 0.004 \: N$