Answer:
40 j, 80j.
Explanation:
P.E= mgh. G=10 m/s².
For 4m, P.E=1*10*4=40 joules.
For 8m, P.E=1*10*8=80 joules.
the answer is a) 0.00235 because 1/425=0.00235. hope I helped!
C) Radiation that comes from Earth...... Hope it helps, Have a nice day :)
