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Byju's Answer
Standard IX
Physics
The Equations of Motion
A motor car r...
Question
A motor car running at the rate of 7m/s can be stopped by applying brakes in 10 m. Show that the total resistance to the motion when brakes are on ,is one fourth of the weight of the car.
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Solution
Answer
u
=
7
m
/
s
v
=
0
S
=
10
m
we
know
v
2
-
u
2
=
2
aS
a
=
v
2
-
u
2
2
S
=
0
-
7
2
2
×
10
a
=
-
2
.
45
m
/
s
2
if
we
take
g
=
9
.
8
m
/
s
2
we
get
a
=
-
9
.
8
4
=
-
g
4
total
resistance
of
motion
-
F
=
-
ma
=
mg
4
resistance
=
weight
of
the
body
4
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