Question

A. Zero C. Equal to its initial horizontal componem B. Equal to its initial vertical component D. Maximum Q. 8 The kinetic energy of a projectile at its maximum height is \( 25 \% \) of its initial KE. The launch angle is: A. \( 30^{\circ} \) C. \( 45^{\circ} \) B. \( 60^{\circ} \) D. \( 75^{\circ} \) Q. 9 Two objects have displacement-time graphs with slopes \( 45^{\circ} \) and \( 60^{\circ} \). Their speed ratio is: C. \( \sqrt{3}: 1 \)

          A. Zero
C. Equal to its initial horizontal componem
B. Equal to its initial vertical component
D. Maximum
Q. 8 The kinetic energy of a projectile at its maximum height is \( 25 \% \) of its initial KE. The launch angle is:
A. \( 30^{\circ} \)
C. \( 45^{\circ} \)
B. \( 60^{\circ} \)
D. \( 75^{\circ} \)
Q. 9 Two objects have displacement-time graphs with slopes \( 45^{\circ} \) and \( 60^{\circ} \). Their speed ratio is:
C. \( \sqrt{3}: 1 \)

A. Zero
C. Equal to its initial horizontal componem
B. Equal to its initial vertical component
D. Maximum
Q. 8 The kinetic energy of a projectile at its maximum height is 25 % of its initial KE. The launch angle is:
A. 30^∘
C. 45^∘
B. 60^∘
D. 75^∘
Q. 9 Two objects have displacement-time graphs with slopes 45^∘ and 60^∘. Their speed ratio is:
C. √(3): 1

Added by Aaron M.

Physics for IIT - JEE 2012-13 mechanics I

B.M. Sharma 2011 Edition

Chapter 5

Instant Answer

Solved by Expert David Morabito

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We need to find the launch angle of a projectile given that its kinetic energy at maximum height is 25% of its initial kinetic energy. Show more…

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A. Zero C. Equal to its initial horizontal componem B. Equal to its initial vertical component D. Maximum Q. 8 The kinetic energy of a projectile at its maximum height is \( 25 \% \) of its initial KE. The launch angle is: A. \( 30^{\circ} \) C. \( 45^{\circ} \) B. \( 60^{\circ} \) D. \( 75^{\circ} \) Q. 9 Two objects have displacement-time graphs with slopes \( 45^{\circ} \) and \( 60^{\circ} \). Their speed ratio is: C. \( \sqrt{3}: 1 \)