# Velocity versus t

Given, m = 50g

F =?

We know, Force = mass × acceleration

= * 10 = 0.5 N

The velocity of the ball zero time is 80ms-1. It decelerates due to the friction of the floor with itself and comes to rest after 8 seconds.

a = =

= -10m/s2

The negative sign indicates that the frictional force exerted opposes the motion of the ball. Now, using Newton’s relation,

F = m× a

= × -10

= -0.5 N

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