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The position of an object is given by v...

The position of an object is given by ` vecr= ( 9 thati + 4t^(3)hatj) ` m. find its velocity at time t= 1s.

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The correct Answer is:
15 m/s atom angle of `53^(@)` with x-axis .
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  2. The velocity (in m/s) of an object changes from vecv(1) = 10 hati + ...

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  3. The position of an object is given by vecr= ( 9 thati + 4t^(3)hatj) ...

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  4. The position of an object changes from vecr = ( 2hati + hatj) " m to ...

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  5. The velocity of an object at t =0 is vecv(0) =- 4 hatj m/s . It mov...

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  6. An object starts from rest, and moves under the acceleration veca = 4...

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  7. A boat is moving with a velocity 3hati - 4hatj w.r.t ground. The water...

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  8. A boat is moving towards east velocity 4 m/s w.r.t still water and riv...

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  9. Rain is falling vertically with a speed of 35 m s^(-1) . A woman rides...

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  10. A ship is steaming towards east with a speed of 8 m/s. A women runs ac...

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  11. A boat stems in a river with velocity 2hati + hatj with respecitve t...

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  12. A bus appears to move northwards at a speed of 20sqrt3 " km h"^(-1) ...

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  13. Find the velocity of a projectile at the highest point, if it is proje...

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  14. A cricket ball is thrown at a speed of 28 ms^(-1) in a direction 30 ...

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  15. A bullet fired at an angle of 60^(@) with the vertical his the level...

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  16. An object is projected with velocity vecv(0) = 15hatj + 20hatj . Cons...

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  17. A player kicks a ball at an angle of 37^(@) to the horizontal with an...

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  18. Find the ratio of maximum horizontal range and the maximum height atta...

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  19. From the top of a 490 m high cliff, a boy throws a stone horizontally ...

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  20. In the above problem, find the speed with which the stone hits the gro...

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