1.

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

Answer»

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



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