A lift moves upward at 5 m s⁻¹. A ball is thrown upward from inside the lift at 20 m s⁻¹ relative to the lift. Enter the time in seconds for the ball to return to the thrower's hand, taking g = 10 m s⁻².
A lift moves upward at 5 m s⁻¹. A ball is thrown upward from inside the lift at 20 m s⁻¹ relative to the lift. Enter the time in seconds for the ball to return to the thrower's hand, taking g = 10 m s⁻².