First slide

Projectile motion

Question

A body, projected with a certain kinetic energy, has a horizontal range R. The kinetic energy will be minimum at a position of the projectile when its horizontal range is

Moderate

A

R
B

3R/4
C

R/2
D

R/4

Solution

Kinetic energy is minimum when the projectile is at the highest point of its trajectory. At the highest point, its range = half the horizontal range. Hence the correct choice is (c).

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