At the National Physics Laboratory in England a measurement of the gravitational acceleration g g was made by throwing a glass ball straight up in an evacuated tube and letting it return, as shown in the Figure. The time interval between the two passages across the lower level is equal to T L = 2.360 T L =2.360 s. The time interval between the two passages across the upper level is equal to T H = 1.340 T H =1.340 s. The distance between the two levels is equal to H = 4.826 H=4.826 m. bookmark_border2.0p 9 Calculate the magnitude of g g (in m/s 2 2 ) that they extracted from this measurement. Hint: The goal is to find enough equations to match the number of your unknowns, which makes the problem solvable. One unknown variable is clearly the gravitational constant g g. Your task is to identify others and write expressions (based on your knowledge of 1D kinematics), such that you can solve for g g. It may also help to consider the symmetry of the parabolic motion