Question

a ball is thrown vertically upward with a speed of 120 m/s.its speed at midpoint of its path is about ?
a)96.2 m/s
b)60 m/s
c) 75 m/s
d) 84.6 m/s

Answer 1

D is the answer . Hope u get it

Thankx

Answer 2

Given,

Initial Velocity (u) = 120 m/s

Acceleration due to Gravity (g) = 10 m/s^2

Since,


=> v^2 = u^2 +2gh

=> 0^2 = (120)^2 -(2 x 10 x h)

=> 0 = 14400 - 20h

=> 20h = 14400

=> h = 14400/20

=> h = 720 m

Now,

Height of mid point = S = h/2 = 720/2 = 360 m

Again,

=> v^2-u^2 = 2gs

=> v^2 - 14400 = 2 x (-10) x 360

=> v^2 = (14400-7200)

=> v^2 = 7200

$= > v \: \: = \sqrt{7200}$

$= > v \: \: = 60 \sqrt{2}$

=> v = 60 x 1.414 m/s

=> v = 84.6 m/s


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