H2.12 1/1 point (graded) A motorcycle that is slowing down uniformly covers two successive kilometers in 200s. It takes the motorcycle 80 s for the first kilometer and 120 s for the second kilometer. Calculate its velocity (in km/h) at the end of the 2-km trip. 21 V 21 H2.13 6/6 points (graded) A particle at rest leaves the origin with its velocity increasing with time according to v (t) = 3.2t m/s. At 5.0 s, the particle's velocity starts decreasing according to v (t) = [16.0-1.5 (t-5.0)] m/s. This decrease continues until t = 11.0 s, after which the particle's velocity remains constant at v (t) = 7.0 m/s. In all following cases enter your answer without units to two significant figures a. What is the acceleration of the particle (in m/s2) at t ? 5s: 3.2 V 3.2 5s < < 11s: -1.5 V -1.5 t>11s: 0 V 0 b. What is the position (in m) of the particle at t = 2.0s: 6.4 V 6.4 t = 7.0s: 69 V 69 t= 12.0s: 116 V 116