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physic厉害的进来! |
| 还有问题想问~ ms per square ^ s = ms per second? 这题我也是不会啊~ A stone falls freely from rest for 4s. Determine the distance covered during (a) the 2nd second , and 一样,s=ut+0.5at^2 u=0 a=9.81 或 10 t=2 (b) the last second ![]() 一样,t=4 |