Grade 12Mechanics

Velocity of a stone projected ,2 second before it reaches the maximum height ,make angle 53 degrees with the horizontal then the velocity at highest point will be

20m/ss

15m/s

25m/s

80/3 m/s

Riya Das

7 Years agoGrade 12

1 Answer

Arun

7 Years ago

Dear student

Acc to ques, 2 seconds before it reaches the maximum height it makes an angle of 53 deg

=> Initial velocity of y-component will be (Uy)=Usin53

=> Initial velocity of x-component will be (Ux)=Ucos53

Therefore, Vy=Uy-gt

=>0=Usin53-20

=>U=25m/s

Now, At highest point the y-component velocity is 0, only x-comp velocity exists which remians constant throughout the projectile motion.

Hence, At highest point the overall velocity of stone will be equal to the x-component velocity

ie, Ucos53=25x3/5=15m/s ANSWER

Hope it helps

Regards

Arun

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Velocity of a stone projected ,2 second before it reaches the maximum height ,make angle 53 degrees with the horizontal then the velocity at highest point will be 20m/ss 15m/s 25m/s 80/3 m/s

Riya Das

1 Answer

Arun

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Velocity of a stone projected ,2 second before it reaches the maximum height ,make angle 53 degrees with the horizontal then the velocity at highest point will be

20m/ss

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25m/s

80/3 m/s

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