A stone is projected at angle 30° to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be -

Question

A stone is projected at angle 30° to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be - (A) 4: 1 (B) 1: 2 (C) 4: 3 (D) 1: 4

Tardigrade Admin · Accepted Answer

( KE POP / KE text top )=((1/2) M ( u )2/(1)2 M ( u cos 30°)2)=(4/3)

Q. A stone is projected at angle $3 0^{\circ}$ to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be -

$4 : 1$

$1 : 2$

$4 : 3$

$1 : 4$

$\frac{K E _{POP}}{K E _{top}} = \frac{\frac{1}{2} M ( u ) ^{2}}{\frac{1}{2} M ( u c o s 3 0 ^{\circ} ) ^{2}} = \frac{4}{3}$

Q. A stone is projected at angle 30∘ to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be -

4:1

1:2

4:3

1:4