D
Explanation:
Mutiply and alagrab to subterc
F=MA
F=(8 kg)(9.8 m/s)
F= 78.4 N
W=FD
W=(78.4 N)(7 m)
W=548.8 J
How this helps
It's Photoelectric Effect, I just a test with this same question. I am not good for explaining exactly how, but I was right.
Heat stroke had occurred when your body can no longer regulate its temperature. hope it helps :)
