Question

A stone is projected vertically upwards.If it travels equal distances in 4th second and 5th second,then find the time of flight of stone in seconds (g=10m/s^2)​

Answer 1

Please refer to attachment

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Answer 2

u+ 210 ×7=0+ 210×9

u=45−35

u=10

Velocity =10 m/sec

Velocity equals --m/sec.

Distance travel

=10×4+ 21 ×10×16

=40+80

=120m

s=ut+ 212

120=10t+5t

t 2 +2t−24=0

t=4

t=(−6)

Time = 4 seconds.

Flight ✈ = 2 to

=2×4

=8sec