If you are asked to determine an objects speed, what information must you have?
a: distance and period of time
b: distance and direction
c: period of time and direction
d: distance and change in position

Mr. gewanter, whose mass is 60.0 kg, is doing a physics demonstration in the front of the classroom. a) how much gravitational force does he exert on 55.0-kg martha in the front row, 1.50 m away? b) how does this compare to what he exerts on 65.0-kg lester, 4.00 m away in the back row?