Two uniform solid balls, one of radius r and mass m, the other of radius 2r and mass 8m, roll down a high incline. they start together from rest at the top of the incline. which one will reach the bottom of the incline first?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

What will a positive and a negative charge do if they are separated from each other?