A car of mass 1100 kg moves at 24 m/s. What is the braking force needed to bring the car to a halt in 2.0 seconds
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5
Answer:
We want the negative acceleration (deceleration) needed for the car to stop; we can use:
v
f
=
v
i
+
a
t
with our data:
0
=
17
+
a
(
10
)
a
=
−
17
10
=
−
1.7
m
s
2
corresponding to a (breaking) force:
F
=
m
a
=
1000
⋅
(
−
1.7
)
=
−
1700
N
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