Question

一物体以5米每秒的速度沿倾斜角37度的固定斜面上滑,已知物体的动磨擦因数卫0.5,设斜面足够长,求物体...

Answer 1

a1=-(μ*g*cos37+g*sin37)=-10(m/s^2)

0-v1=a1*t1,t1=0.5(s) ,s=v1*t1-1/2*|a1|*t1^2=1.25 (m),

v1均=s/t1=2.5(m/s),a2=g*sin37-μ*g*cos37=2(m/s^2)

s=1/2*a2*t2^2,t2=√5/2,v2=√5,v2均=s/t2=√5/2(m/s)