Answer:
1st box: increase
supporting evidence: As the girl swings downward she will gain more height due to the increasing force pushing her
2nd box: increase
supporting evidence: the magnetic force of the earth will increase the kinetic energy of the girl when she goes downward slightly as she swings forward
3rd box :increase
supporting evidence:As the girl swings downward she will gain more speed due to the gravitational pull
Explanation:
Mass of the system is 25.2 kg
Calculation:
F=ma
m = F/a where a = m/t^2
a=2.3/(1.3)^2 = 1.36 m/s^2
m=34.3/1.36
m=25.2 Kg
Kinetic Energy = (1/2) (mass) (speed)²
KE = (1/2) (400 kg) (50 m/s)²
KE = (200 kg) (2500 m²/s²)
KE = 500,000 kg-m²/s²
<em>KE = 500,000 Joules</em>
KE = 1/2 Mega-Joule