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  4. A projectile is fired at 30° with momentum p. Neglecting friction, the change in kinetic energy, when it returns back to the ground, will be

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Q. A projectile is fired at $30^{\circ}$ with momentum $p$. Neglecting friction, the change in kinetic energy, when it returns back to the ground, will be

AMUAMU 2005

Solution:

The energy possessed by a body due to velocity $(v)$ is known as kinetic energy of the body. When a body is projected with velocity $v$ at an angle $\theta$ with the horizontal, then kinetic energy (KE) of projection
$=$ kinetic energy of returning.
image
Since, velocity of projection is equal to velocity of return.
Hence, change in kinetic energy is zero.