Question1
A 0.31 kg softball has a velocity of 14 m/s at an angle of 44° below horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of?
(a) 25 m/s, vertically downward, and
(b) 25 m/s, horizontally back toward pitcher?
Question2
Two point charges Q 1 5 15.00 nC and Q 2 5 23.00 nC are unconnected by 35.0 cm.
(a) What is an electric potential at a point midway between the charges?
(b) What is potential energy of the pair of charges? What is importance of the algebraic sign of answer?