Hi, I need help for two physics problems.

problem n.1

Catching a Ball on Ice - Calculations MR Review v PartA Olaf is initially standing (at rest) on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400 kg that is traveling horizontally at 11.5 m/s to the LEFT toward Olaf. Olaf's Note: velocity has directions (signs), but no sign for speed A B In drawing A on the left side, If Olaf catches the ball, with what speed v do Olaf and the ball move afterward? Express your answer numerically in meters per second. View Available Hint(s) - - . . .. g = m/s Previous Answers % Incorrect; Try Again; 4 attempts remaining mass is 71.7 kg . v PartB In drawing B on the right side: If the ball hits Olaf and bounces off his chest horizontally at 8.00 m/s in the opposite direction (now to the RIGHT), what is his speed v; after the collision? Note: velocity has directions (signs), but no sign for speed Express your answer numerically in meters per second. View Available Hint(s) M. .. g = m/s Collisions in One Dimension - Calculations On a frictionless horizontal air table, puck A (with mass 0.250 kg ) is moving toward puck B (with mass 0.365 kg ), which is initially at rest. After the collision, puck A has velocity 0.116 m/s to the left, and puck B has velocity 0.651 m/s to the right. Pay attention to the direction of each VELOCITY. MR Review Part A What was the speed v,; of puck A before the collision? Keep 3 digits after the decimal point. P View Available Hint(s) Bl . .= Vps = m/s Part B Calculate AK E, the change in the total kinetic energy of the system that occurs during the collision. This is a small quantity. If you use a regular number (not the scientific notation(, keep 4 digits after the decimal point. P View Available Hint(s) 'f'C)@H? AKE, = J