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A shell is fired into air at an angle θ with the horizontal from the ground. On reaching the maximum height,

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its potential energy is equal to zero

both its potential and kinetic energies are zero

its kinetic energy is not equal to zero

its kinetic energy is equal to zero

answer is A.

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Detailed Solution

At the highest point, vertical component of velocity of the shell becomes zero, but horizontal component of velocity is ucosθ so its kinetic energy $\large =\frac 12m(ucos\theta)^2$

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