A dart is thrown straight up. After it leaves the player’s hand, it steadily loses speed as it gains altitude until it lodges in the ceiling of the game room. Draw the dart’s velocity vector at times t₁ and t₂, where Δt = t₂ - t₁ is small. From your drawing find the direction of the change in velocity Δv = v₂ - v₁, and thus the direction of the acceleration vector.