A particle is projected from a trolley car with a velocity v→. If the trolley car moves with an acceleration a→ towards right, which of the following remain unchanged relative to both ground and trolley car?

Vertical component of projectile relative to trolley,vyT = v sin θAnd vertical component of projectile relative to groundvyG = v sin θVertical component is unchanged relative to trolley and ground.Now time of flight = 2u sinθgTime of flight remains unchanged relative to trolley & ground.