Problem $10$: A hot$-$air balloon rises from ground level, moving straight upward at a constant speed of

$6\mathrm{.}75$ m$/$s

$.$ At

$25\mathrm{.}7$ s

after liftoff, a sandbag is accidentally dropped from the balloon. Neglect air resistance. A

$50\%$

Part $($a$)$ How long, in seconds, does it take the sandbag to reach the ground from the moment it falls off the balloon? $\backslash [$ t$=\backslash ]$ Hints: $05$ deduction per hint. Hints remaining: $1$ Feedback: $05$ dedaction per feedbuck: a

$50\%$

Part $($b$)$ How fast is the sandbag moving, in

m$/$s

$,$ just before it hits the ground?