Answer:
The
velocity time graph shows that the velocity of the ball at t = 0 is zero.
Initial velocity of ball, u = 0.
Velocity of ball at t
= 4 s is 20 \[\text{m}{{\text{s}}^{\text{-1}}}\]
That is,
final velocity, u = 20 \[\text{m}{{\text{s}}^{\text{-1}}}\]
Time,
t = 4 s
\[\therefore
\]Acceleration of the ball, \[a=\frac{\upsilon -u}{t}\]
or \[a=\frac{20\,\text{m}{{\text{s}}^{-1}}-0}{4s}\Rightarrow
a=5\,\text{m}{{\text{s}}^{-2}}\]
Also, mass
of ball, \[m=100g=\frac{100}{1000}kg=\frac{1}{10}kg\]
\[\therefore
\]Force acting on the ball, F= ma
or\[F=\frac{1}{10}kg\times
5m{{s}^{-2}}\]
\[=0.5kgv-m{{s}^{-2}}0.5N[\because
1kg\,m{{s}^{-2}}=1N]\]
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