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Class 11 NEET Physics Motion in a Straight Line Questions
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© examsnet.com
Question : 54
Total: 58
A car moves a distance of
200
m
.
It covers the first half of the distance at speed
40
km
∕
h
and the second half of distance at speed
v
. The average speed is
48
km
∕
h
. The value of
v
is
( 1991 )
56
km
∕
h
60
km
∕
h
50
km
∕
h
48
km
∕
h
Validate
Solution:
Total distance travelled =
200
m
Total time taken
=
100
40
+
100
v
Average speed
=
total distance travelled
total time taken
48
=
200
(
100
40
+
100
v
)
or
48
=
2
(
1
40
+
1
v
)
or
1
40
+
1
v
=
1
24
or
1
v
=
1
24
−
1
40
=
1
60
or
v
=
60
km
∕
hr
© examsnet.com
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