Need help on all parts

(9%) Problem 10: During an ice show, a 72.5-kg skater leaps into the air and is caught by an initially stationary 75 kg skater. A 50% Part (a) What is their final speed, in meters per second, assuming negligible friction and that the 72.5 kg skater's initial horizontal speed is 3.95 m/s? Grade Summary v' = Deductions Potential 10 sin() cos tan() 7 8 9 HOME Submissions Attempts remaining cotan() asino acos() E 4 5 6 (4% per attempt) atan( acotan() sinh() 2 3 detailed view cosh( tanh( cotanh() + 0 END Degrees . Radians VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 4% deduction per hint. Hints remaining: 1 Feedback: 5% deduction per feedback. A 50% Part (b) How much kinetic energy is lost, in joules