Question

a body is projected such that its kinetic energy at the angle of projection with the horizontal is
​

Answer 1

Explanation:

KE(initial) =

2

1

mu

2

KE(final) =

2

1

m(ucosθ)

2

2

1

mu

2

cos

2

θ=

4

3

×

2

1

mu

2

cosθ=

2

3

θ=30

∘