A 73.2 kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushed a distance of 7.6 m starting from rest, its speed is 6.6 m/s. Find the magnitude of the net force on the bobsled. A
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Answer:
F= 300 N
Explanation:
from the equations of movement:
v
=
a
×
t
from which
t
=
v
a
and
s
=
s
°
+
v
°
×
t
+
1
2
a
×
t
2
since s° = 0 and v° = 0
s
=
1
2
a
×
(
v
a
)
2
s
=
1
2
×
v
2
a
a
=
1
2
×
v
2
s
=
1
2
×
(
6
m
s
)
2
4.5
m
=
4
m
s
2
from second dynamic principle
F
=
m
×
a
=
75
k
g
×
4
m
s
2
=
300
N
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