Im pretty sure it’s a because it makes more sense you know?.
Answer:

Given:
Force = 8 N
Distance covered by the body = 50 cm = 0.5 m
Explanation:
Work Done = Force × Distance covered by the body
= 8 × 0.5
= 4 J
Electromagnets can be turned off, this makes it easier to release things from the magnetic field.
Hope this helps :)
Answer:
30 kilometers is a reasonable measurement
Answer:
0.08024 W/m²
Explanation:
P = Power
= Distance = 15 m
= Intensity at 15 m = 0.26 W/m²
= Distance = 27 m
= Intensity at 27 m
Sound intensity is given by


So, we have the relation

The sound intensity at the given distance is 0.08024 W/m²