How to find the horizontal displacement when only the angle given?is that possible?

object is projected with a V m/s velocity.its maximum horizontal range is 2h.Also what is the horizontal range when projected angle is (|)30 degrees (||) 60 degrees?

Quote:

object is projected with a V m/s velocity.its maximum horizontal range is 2h

fine.it can be done.

x=vēsin 2Θ/g

because 2h is maximum,its angle has to be 45.

so Θ=45

x=vē/g

2h=vē/10

v=√20h

But! How am I supposed to Find the velocity when only the angle is given like that?????

it can't be same V as before because that V is for 45 degree angle,right?

help!

Thanks