# The speed time graph of a ball of mass 30g moving along a straight line is shown in (figure). Calculate the opposing force that brings the ball to r

889 views
in Physics
closed
The speed time graph of a ball of mass 30g moving along a straight line is shown in (figure). Calculate the opposing force that brings the ball to rest.

by (68.5k points)
selected by

Here m=30g= 0.03kg, F=?
From the graph, we find u=50m//s, v=0, t=4 s
As v=u+at
:. 0=50+axx4, a=(-50)/4= -12.5m//s^(2)
F=ma= 0.03xx(-12.5)= -0.37N
Negative sign is for opposing force of friction.