Answer:
2
Explanation:
İf system ideal ( no frictional force )
Fnet=m.a
20=10.a
a=2m/s2
Speed= (4.92-2.45) 2.47 m/s
Distance= ?
You didn't mention about the distance?
All of the following statements are true except (3 points)<span>stars and planets formed after the Big Bang.stars formed from remnants of broken planets.stars and planets condensed from gas and dust.heavenly bodies formed because of gravity.</span>
The electric field E of a charge is defined as E=F/Q where F is the Coulomb force and Q is the test charge.
E=(1/Q)*k*(q*Q)/r², where k=9*10^9 N*m²/C², q is the point charge, Q is the test charge and r is the distance between the charges.
So E=(k*q)/r²
When we input the numbers we get that electric field E of a point chage q is:
E=(9*10^9)*(5.4*10^-8)/0.2²=486/0.04=12150 N/C.
This is roughly E=12000 N/C =1.2*10^4 N/C
The correct answer is B.
