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A ball was thrown by a boy a at angle 60...

A ball was thrown by a boy a at angle `60^(@)` with horizontal at height 1 m from ground. Boy B is running in the plane of motion of ball and catches the ball at height 1 m from ground. He finds the ball falling vertically. If the boy is running at a speed 20 km/hr. Then the velocity of projection of ball is-

A

20 km/hr

B

30 km/hr

C

40 km/hr

D

50 km/hr

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The correct Answer is:
C
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ALLEN -KINEMATICS-2D-Exercise (O-2)
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  2. A particle is projected an angle of 45^(@) from 8m before the foot of ...

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  3. A ball was thrown by a boy a at angle 60^(@) with horizontal at height...

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  4. A light body is projected with a velocity (10hat(i)+20 hat(j)+20 hat(k...

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  5. A projectile is projected as shown in figure. A proper light arrangeme...

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  6. A particle is ejected from the tube at A with a velocity V at an angle...

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  7. A stone is projected from point P on the inclined plane with velocity ...

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  8. Time taken by the particle to reach from A to B is t. Then the distanc...

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  9. A particle is projected from a point P (2,0,0)m with a velocity 10(m)/...

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  10. A body A is thrown vertically upwards with such a velocity that it rea...

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  11. An object moves to the East across a frictionless surface with constan...

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  12. A particle is thrown from a stationary platform with velocity v at an ...

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  13. On a particular day rain drops are falling vertically at a speed of 5 ...

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  14. A 2-m wide truck is moving with a uniform speed v(0)=8 m/s along a str...

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  15. Man A is sitting in a car moving with a speed of 54 (km)/(hr) observes...

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  16. A swimmer swins in still water at a speed =5 km//hr. He enters a 200m ...

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  17. A man wishes to swim across a river 40 m wide flowing with a speed of ...

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  18. An observer on ground sees a boat cross a river of width 800 m perpend...

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  19. A boatman moves his boat with a velocity 'v' (relative to water) in ri...

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  20. A ball is thrown at an angle theta up to the top of a cliff of height ...

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