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Motion in a Straight Line
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Acceleration
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A particle moving, eastwards with a velo
Question
A particle moving, eastwards with a velocity of
5
m
/
s
. In
1
0
s
, its velocity changes to
5
m
/
s
northwards. The average acceleration in this time is
A
Zero
B
2
1
m
/
s
2
towards north-west
C
2
1
m
/
s
2
towards north-east
D
2
1
m
/
s
2
towards north-west
Medium
Open in App
Solution
Verified by Toppr
Correct option is B)
Initial velocity,
u
=
5
m
/
s
eastwards
Final velocity,
v
=
5
m
/
s
northwards
Now, change in the velocity
∣
△
v
∣
=
v
2
+
u
2
=
5
2
+
5
2
=
5
2
And the direction of
△
v
is given by
t
a
n
θ
=
u
v
=
5
−
5
=
−
1
(taking east direction as positive)
θ
=
−
4
π
Now, acceleration
a
=
t
△
v
=
1
0
5
2
=
2
1
m
/
s
2
in north-west direction.
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