A car moving towards east with velocity of 20 m per second. its velocity of 10s is 20 m per second due west .the change in its velocity in this duration of 10 s
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Class 11
>>Physics
>>Motion in a Straight Line
>>Acceleration
>>A particle moving, eastwards with a velo
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A particle moving, eastwards with a velocity of 5m/s. In 10s, its velocity changes to 5m/s northwards. The average acceleration in this time is
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Correct option is B)
Initial velocity, u=5m/s eastwards
Final velocity, v=5m/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
tanθ=
u
v
=
5
−5
=−1 (taking east direction as positive)
θ=−
4
π
Now, acceleration a=
t
△v
=
10
5
2
=
2
1
m/s
2
in north-west direction.
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