The peak of the trajectory occurs at time t1. this is the point where the ball reaches its maximum height ymax. at the peak the ball switches from moving up to moving down, even as it continues to travel horizontally at a constant rate.. part c. what are the values of the velocity vector components v1,x and v1,y (both in m/s) as well as the acceleration vector components a1,x and a1,y (both in m/s2)? here the subscript 1 means that these are all at time t1.. a) 0, 0, 0, 0. b) 0, 0, 0, -9.80. c) 15.0, 0, 0, 0. d) 15.0, 0, 0, -9.80. e) 0, 26.0, 0, 0. f) 0, 26.0, 0, -9.80. g) 15.0, 26.0, 0, 0. h) 15.0, 26.0, 0, -9.80