A dense metal ball moves straight down through air past four equally spaced levels J, K, L and M. The time intervals for it to travel from one level to the next are recorded. At which level is the ball’s speed greatest, and which of the times is the shortest?
- Aspeed greatest between J and K; time shortest between J and K
- Bspeed greatest between J and K; time shortest between L and M
- Cspeed greatest between L and M; time shortest between J and K
- Dspeed greatest between L and M; time shortest between L and M