We can use the following kinematic equation:
$v_f = v_i + at$
where:
$v_f$ = final velocity (0 m/s at the highest point)
$v_i$ = initial velocity (48.41 m/s)
$a$ = acceleration (-9.81 m/s²)
$t$ = time
Solving for t:
$0 = 48.41 - 9.81t$
$t = \frac{48.41}{9.81}
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