Suppose that we are given two non-zero vectors u and v such that u-5j and u-v-0. which of the following statements must be true? there may be more than 1 possibility. o v points east or west 0 v points south 6points 0 v is parallel to u o v is perpendicular to u 。other:
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Ответ:
Explanation:
v = u + at basic kinematic equation
1) a = (v - u)/t = (90 - 80) / 4 = 2.5 km/hr/s
2) a = (v - u)/t = (5 - 20) / 6 = - 2.5 km/hr/s
3) a = (v - u)/t = (4 - 1) / 2 = 1.5 cm/s/s
4) a = (v - u)/t = (20 - 50) / 15 = - 2.0 km/hr/s
5) a = (v - u)/t = (40 - 5) / 6 = - 5.8 m/s/s
6) a = (v - u)/t = (0 - 4) / 0.5 = - 8 m/s/s
7) v = u + at = 0 + 2(16) = 32 m/s
8) t = (v - u)/a = (0 - 80)/-2 = 40 s