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clear
//Given
f=18 //W/cm**2
A=20 //cm**2
t=30*60
c=3.0*10**8
//Calculation
U=f*A*t
P=U/c
F=P/t
P1=2*P
F1=P1/t
//Result
printf("\n Average force exerted on the surface is %0.3f N", F1)
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