Question 20 Part A A proton moving at v1 = 7.6 Mm/s collides elastically and head- on with a second proton moving in the opposite direction at v2 = Find the velocity of the first proton after the collision. 11 Mm/s . Choose positive velocities in the direction of v1. Express your answer using two significant figures. AEQ 7 0 E ? U, = 11 Mm/s K Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remainingQuestion 1 Part A You step into an elevator, and it accelerates to a downward speed of 9.2 m/s in 2.5 s . How does your apparent weight during this acceleration time compare with your actual weight? Express your answer using two significant figures. IVO AED ? Wapp 670 Wo Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remainingQuestion 17 Part A A block of weight 3.9 N is launched up a 30 inclined plane of length 2.40 m by a spring with spring constant 2.25 kN/m and Does the block reach the top of the incline? maximum compression 0.10 m . The coefficient of kinetic friction is 0.50. yes no Submit Previous Answers Correct V Part B If so, how much kinetic energy does it have there; if not, how close to the top, along the incline, does it get? Express your answer using two significant figures. AEQ ? redo K = 8. 19 Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining