Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.
9.8m per seccond is the speed of gravity if you drop something like a ball from a tower
Weight equals mass times gravitational acceleration=400N, so mass=400/9.8=41kg approx.
Answer: P= mad/t or P=w/t so P= 300/6= 50 W
