Question

write the relation between two angles for which horizontal ranges will be equal?

Answer 1

For same range but different angles

According to formula of range
Range= u^2sin2θ/g

Now if θ1= 30 and θ2=60

Sin2(30)= sin60
Sin2(60)= sin120=sin60.

With same speed of projection
As the sine is equal so the range will be equal

Hence relation between the two angles is
θ1:θ2=1:2