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In a projectile motion the velocity (a...

In a projectile motion the velocity
(a) is always perpendicular to the acceleration
(b) is not always perpendicular to the acceleration
(c) is perpendicular to the acceleration for one instant only
(d) is perpendicular to the acceleration for two instants.

A

a & b are correct

B

b & c are correct

C

c & d are correct

D

a & d are correct

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-MOTION IN A PLANE -Exercise -I
  1. A stone is just dropped from the window of a train moving along a hori...

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  2. A and B are two trains moving parallel to each other. If a ball is thr...

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  3. In a projectile motion the velocity (a) is always perpendicular to t...

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  4. A boy is projected from a point with different angles of projection 20...

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  5. Two particles are projected from the same point with the same speed at...

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  6. A body is projected with an initial speed of 100 sqrt(3) ms^(-1) at an...

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  7. Two bodies are projected at angles 30^(@) and 60^(@) to the horizontal...

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  8. Velocity of the body on reaching the ground is same in magnitude in th...

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  9. A bomber flying horizontally with constant speed releases a bomb from ...

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  10. For a projectile .R. is range and .H. is maximum height

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  11. The equation of motion of a projectile is y=ax-bx^(2) , where a and b ...

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  12. The term centripetal acceleration was proposed by

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  13. Centripetal acceleration is

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  14. Velocity vector and acceleration vector in a uniform circulat motion a...

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  15. When milk is churned, cream gets seperated due to

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  16. Suppose a disc is rotating counter clockwise in the plane of the paper...

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  17. A particle of mass M moves in a circular path of radius r with a const...

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  18. A body is in pure rotation. The linear speed v of the particle, the di...

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  19. A particle revolves round a circular path. The acceleration of the par...

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  20. The position vector of a particle isvecr = (a cos omega t)hati + (a si...

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