夢追人
2020-1-13 13:55:15
總之淨係一邊有負
我會覺得搬個負去左邊會比較make sense
x outward係正,所以d^2x/dt^2都係outward係正
F=ma (as vector)
-|F|=ma (淨係睇條線 passing through origin and x, take outward 做正)
Regen
2020-1-13 14:17:26
咁應該明...
Thx
:^(
天鵝食苦瓜
2020-1-13 21:07:32
There are 5 women and 5 men at party.In how many ways can they paired into 5 couples?(Ans:120)
想問下思路係點?