Question

A ball is projected with kinetic energy E, at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become ______.

विकल्प

• Zero

• `"E"/2`

• `"E"/4`

• E

Answer 1

A ball is projected with kinetic energy E, at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become `bb("E"/4)`.

Explanation:

We only have the horizontal component of velocity at the highest point. So, Velocity v = u cos60°

= `"u"/2`

∴ K.E at top most point = `1/2"m"("u"/2)^2="E"/4`