Question 39 (1 point) What is the speed of a 4.50 kg cannon ball if, at a height of 275 m above the ground, its mechanical energy relative to the ground is 6.27x104 J? O 5.06 x 10A4 m/s Q 150 m/s O 239 m/s O 1.21 x 10A4 m/s Question 15 (1 point) What is the magnitude of the force of gravity on an 80 kg astronaut at a location one Earth radius above Earth's surface? 8.0 N 7.8x10^2 N 2.5x1019 N 2.0x10^2 NQuestion 13 (1 point) If the force between two equally massive asteroids in an asteroid belt is 800N, and their distance between centres is 750m, what is each mass? Q 9.00x10"15 kg 0 2.60x10"9 kg 0 3.37x10"18 kg Q 6.75x10"18 kg