Im 99% sure
tan^-1 (6.2/22)= 15.7º
with 2 significant figures 16º
A hypothesis is an educated prediction that can be tested.
First, foremost, and most critically, you must look at the graph, and critically
examine its behavior from just before until just after the 5-seconds point.
Without that ability ... since the graph is nowhere to be found ... I am hardly
in a position to assist you in the process.