This study reveals a new feature of many solar jets: a group height, which links their acceleration and velocity. The acceleration and velocity ( a , V ) for jets such as spicules, often displayed as scattergraphs, show a strong correlation. This can be represented empirically by the equation, V = p a + q , where p and q are two arbitrary non-zero constants. This study reanalyses the ( a , V ) data for nine different groups of jets, in order to test an alternative proposal that a simpler relationship directly links ( a , V ) to the mean height for the group of jets, without needing the empirical constants p and q . A standard mathematical test – plotting log ( a ) against log ( V ), tests whether V ∼ a n and if so, gives the value of n. When this is done for a wide range of jets the index n is consistently found to be close to 0.5 The nine groups of jets include spicules, macrospicules and dynamic fibrils. The result, V ∼ a 0.5 , or equivalently V 2 = k a , with only one constant, provides as close a match to the data as the equation V = p a + q , which requires two unknown constants. It is found that the constant k , is a known quantity: just twice the mean height, s ‾ , of the group of jets being analysed. This then gives the equation V 2 = 2 a s ‾ , for the jets in the group. This more succinct relationship links the acceleration and maximum velocity of every jet in the group to a well-defined quantity – the mean height of the group of spicules, without needing extra constants