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D e a r S t u d e n t T i m e o f f l i g h t = 6 s d i s p l a c e m e n t = 0 a c c e l e r a t i o n = - g = - 9.8 m / s^{2} (a c c e l e r a t i o n i s d o w n w a r d s s o n e g a t i v e s i g n) a) T i m e w h e n i t w a s m a x i m u m h e i g t h = \frac{6}{2} = 3 s W h e n a t m a x i m u m h e i g t h v = 0 v = u + g t 0 = u + (- 9.8) * 3 u = 29.4 m / s i s i n i t i a l s p e e d b) M a x i m u m h e i g h t = h = u t - \frac{1}{2} g t^{2} = 29.4 * 3 - \frac{1}{2} * 9.8 * 3 * 3 h = 44.1 m c) P o s i t i o n a f t e r 4 s = h_{4} = h = u t - \frac{1}{2} g t^{2} = 29.4 * 4 - \frac{1}{2} * 9.8 * 4 * 4 h_{4} = 39.2 m R e g a r d s

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