Projectile Motion

The general trajectory equation for a projectile is: Comparing this with the given equation , we get: Since , we substitute: However, a mistake is evident here.
Let's resolve properly.
Given: Wait, this again gives , which contradicts the correct option being 4 m/s.
Let us double-check with correct substitution.
So our initial assumption must be wrong — either the comparison is incorrect or actual coefficient is different.
Let's do direct coefficient matching: So the actual correct answer is (A) .
The image answer key may be incorrect.