Help with a and b

(20%) Problem 6: A 10.1-kg block of ice slides frictionlessly with a speed of 8. 1 m/s when it collides with an second block of ice with the same mass. D A 50% Part (a) If the two blocks stick together and move frictionlessly after the collision, what is their speed after the collision? Vf = Grade Summary m/s Deductions Potential 100% sin() cos() tan() 2 HOME Submissions cotan() asin() acos() Attempts remaining: 3 sinh() (25% per attempt) atan() acotan() detailed view cosh() tanh() cotanh() + ENI Degrees O Radians BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: Feedback: 50% Part (b) If the two blocks collide elastically, the first block will come to a stop. If the second block moves without friction, what will the speed of the second block be after the collision