An object is dropped from 80 m. With what velocity does it strike the ground? 40

Question

An object is dropped from 80 m. With what velocity does it strike the ground? 40 m/s 45 m/s 80 m/s 160 m/s If an object strikes the ground with a vertical velocity of 50 m/s, from how high was it dropped? 25 m 50 m 100 m 125 m An object strikes the ground with a speed of 25 m/s. If it was originally thrown with a horizontal velocity of 15 m/s, and a vertical velocity of zero, from how high was it dropped? 13 m 15 m 20 m 32 m If a basketball player can jump 2 m into the air, what is his hang time (time in the air)? 0.7 s 1.3 s 2.8 s 4.0 s

Explanation / Answer

Here ,

114.

v = sqrt(2 * g * h)

v = sqrt(2 * 9.8 * 80)

v = 39.6 m/s

option A 40 m/s

115.

height , h = u^2/(2 * g)

h = 50^2/(2 * 9.8)

h = 127.5 = 125 m

option D) 125 m

116.

v = 25 m/s

u =15 m/s

let the height is h

v^2 - u^2 = 2 * a * d

25^2 - 15^2 = 2 * 10 * h

h = 20 m

option C)

117.

h = 2 m

let the time is t

t = 2 * sqrt(2h/g)

t = 2 * sqrt(2 * 2/10)

t = 1.26 = 1.3 s

the hang time is 1.3 s

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