7
Substituting the initial conditions in the obtained dierential equation, we will nd that C = 10
m
.
s
us, the equation of the velocity changes in the time interval from zero to t
1
:
x
̇
= – g(sin α + f cos α) t +
25
t
2
+ 10 .
s
At time instant t = 3 s:
v
1
= x
̇
1
= – 9.81(0.5 + 0.1 ∙ 0.87) ∙ 3 +
25
∙ 9 + 10 = 2.1
m
.
24
s
1.3 SOLUTION
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