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T= 10 seconds 
S distance= 200 cm=2 metres
mass = 300 grams= 0.3 kilograms.
Velocity=S/t=2/10=0.2 metre/ sec.
initial velocity u= 0
Acceleration = (v-u)/t
a=0.02 metre/sec²
Now mass = 0.3 kg
So force=m×a
Force=0.006 Newtons.
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