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A body is projected horizontally with sp...

A body is projected horizontally with speed `30m//s` from a very high tower. What will be its speed after 4sec-

A

`20 m//s`

B

`50 m//s`

C

`54 m//s`

D

`70 m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
`v_(x)=30 m//s rArr v_(y)=40 m//s rArr v=50 m//s`.
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RESONANCE-DAILY PRACTICE PROBLEM-DPP No.11
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  2. Figure shows the velocity time graph of a particle moving along straig...

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  3. Two projectiles A and B are projected with same speed at an angle 30^(...

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  4. For ground to ground projectile motion equation of path is y=12x-3//4x...

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  5. A particle is projected from the inclined plane at angle 37^(@) with t...

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  6. For a particle under going rectilinear motion with uniform acceleratio...

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  7. For which of the following graphs the average velocity of a particle m...

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  8. A train starts form station A at 1pm and reaches station B at 3pm, aft...

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  9. A body is projected horizontally with speed 30m//s from a very high to...

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  10. The projection of bar(A) = 2hati +2hatj +5hatk on to bar(B) = hati -ha...

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  11. A body dropped from the top of a tower covers 7/16 of the total height...

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  12. A man is 180 cm tall and his eyes are 10 cm below the top of his head....

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  14. A body is located on a wall. Its image of equal size is to be obtained...

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  15. An equiconvex lens is cut into two halves along (i) XOX^(') and (ii) Y...

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  16. A light is incident on face AB of an equilateral glass prism ABC. Afte...

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  17. In a compound microscope

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  18. A thin prism of glass is placed in air and water respectively. If n(0)...

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  19. The deviation caused for red, yellow and violet colours for crown glas...

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  20. The velocity at the maximum height of a projectile is half of its velo...

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