1,连续相等时间内位移差为常数
ΔX=aT^2
1.5cm=a0.1^2
a=150cm/s^2
=1.5m/s^2
2,
∑F=ma
=2*1.5
=3N
3,
∑F=F-μmg
3=7-μ 20
μ =0.2
4,
S=at^2/2
=1.5*3^2/2
=6.75m
1,连续相等时间内位移差为常数
ΔX=aT^2
1.5cm=a0.1^2
a=150cm/s^2
=1.5m/s^2
2,
∑F=ma
=2*1.5
=3N
3,
∑F=F-μmg
3=7-μ 20
μ =0.2
4,
S=at^2/2
=1.5*3^2/2
=6.75m