大师作文网一道英文数学题,能量转换的,请大虾帮忙,
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一道英文数学题,能量转换的,请大虾帮忙,
A and B are two points 1km apart on a straight road,and B is 60 metres higher than A,A car of mass 1200kg passes A travelling at 25m/s.Between A and B the engine produces a constant driving force of 1600N,and there is a constant resisitance to motion of 1150N.Calculate the speed of the car as it passes B.
麻烦把最后结果写上最好
A and B are two points 1km apart on a straight road,and B is 60 metres higher than A,A car of mass 1200kg passes A travelling at 25m/s.Between A and B the engine produces a constant driving force of 1600N,and there is a constant resisitance to motion of 1150N.Calculate the speed of the car as it passes B.
麻烦把最后结果写上最好
能量守能
a=（1600-1200-势能）/质量
v0=25m/s
s=v0*t+(a*t^2)/2 = 60 meters
求出t.
v1=v0+at
求出v1.
初中简单物理题,不过太久没用了,忘得差不多了,将就看.
a=（1600-1200-势能）/质量
v0=25m/s
s=v0*t+(a*t^2)/2 = 60 meters
求出t.
v1=v0+at
求出v1.
初中简单物理题,不过太久没用了,忘得差不多了,将就看.