Question

A body is projected an angle of 45° from the ground
with a certain kinetic energy. When the body
reaches the highest point, its kinetic energy
(1) becomes half
(2) remains same
(3)
becomes zero
(4) becomes one fourth
​

Answer 1

Explanation:

Kinetic Energy , E=

2

1

mv

2

At the highest point , vertical component of velocity becomes zero and only the horizontal is left that is given by

u

x

=ucosθ

θ=45°,socosθ=

2

1

u

x

=

2

u

Kinetic energy E at the highest point =

2

1

m(

2

u

)

2

=

2

E