Question

while a helicopter is descending vertically an aviation kit dropped from it.if the height of the helicopter when the kit is dropped is 590m.find how much time does the kit reach the ground ,also find the final velocity before it touches the ground.

Answer 1

Initial velocity, u = 0
Final velocity, v = ?
Time, t = ?
Height, s = 490 m
Gravity, a/g = 9.8 m/s²

s = ut + ½at²
490 = 0 + ½(9.8)t²
490 = 4.9t²
t = 10 s

v = u + at
v = 0 + 9.8(10)
v = 98 m/s