Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. state your assumptions, such as the mower moves with a 1 km/hr speed, and has a 0.5 m width.

Ans: 8 hours and 90 minutes

The length of Football field = 300ft by 160 ft.

On converting it into meter, we get length of field = 91.44 m

and the width of field = 48.8 m 

Now, distance = Area moved/ width = (91.44*48.8) / 0.5 = 8924.55 m = 8.9245 km

Ans, Time taken = distance*speed = 8.9245*1 km/hr = 8 hours and 90 minutes

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr