A ball is kicked from the ground into the air After 2 seconds, it is observed to have a velocity of 35i + 20j m/s. The ball's speed at the highest point is
A) 0 m/s
B) 30 m/s
C) 35 m/s
D) 40 m/s
E) 45 m/s

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton

When you notice something that is happening, what are you making? a. an observation b. a law c. a theory d. an experiment