Question

A ball of 200 g mass is moved with 20 m/s, and
decreases to 10 m/s in 5 seconds due to air friction.
So, force of friction due to air is​

Answer 1

Answer:

0.4N

Explanation:

Force(F) = mass(m) * acceleration(a)

Mass is 0.2kg (It should be in its SI unit for calculation)

But we dont have acceleration

Acceleration formula

$=\frac{Finalvelocity(v) - Initial velocity(u)}{time taken(t)}\\=\frac{10-20}{5}\\=\frac{-10}{5}\\=-2m/s^{2}$

But we can use its absolute value ( $2m/s^{2}$ )

F = ma

F = 0.2 * 2

F = 0.4N