※ 引述《nervouschang (拚物理作業中...)》之銘言：
A 1000 kg boat traveling at 90km/h when its engine is shut off.
The magnitude of the frictional force fk(newton)=70v(m/s).
Find the time required for the boat to slow to 45 km/h.
某資工高手的解答:
a=dv/dt=f/m=70v/m
70dt/m=dv/v
二邊積分==> 70T/m=ln(v0)-ln(v1)
就是這樣...數字就不算了
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 218.166.36.81