(1)a 1=
=
m/s 2=
m/s 2
(2)h1=
υ 1t 1=
×100×30m=1500m
h 2=
(υ 1+υ 2)△t 2=
×(100+240)×25m=4250m
(3)h 3=
υ 2△t 3=
×240×25m=3000m
H=h 1+h 2+h 3=8750m
(1)a 1=
=
m/s 2=
m/s 2
(2)h1=
υ 1t 1=
×100×30m=1500m
h 2=
(υ 1+υ 2)△t 2=
×(100+240)×25m=4250m
(3)h 3=
υ 2△t 3=
×240×25m=3000m
H=h 1+h 2+h 3=8750m