A child drops a ball from a window The ball strikes the ground in 3 0 seconds What - Science - Motion

Question

A child drops a ball from a window The ball strikes the ground in 3
0 seconds What is the velocity of the ball the instant before it
hits the ground? In some answers answered by experts, they write
tht acceleration = 10m/s But how do get 1om/s? It is not mentioned
in the question!

Deepika Sharma · Accepted Answer

Dear Student,

Here,
Initial speed, u = 0
Acceleration, a = 10 m/s2 (as not mentioned)
It is acceleration due to gravity (g), it has constant value 9 8
m/s2, we take it appropriate 10 m/s2
[Acceleration due to gravity is the acceleration set up in the body
when it falls freely under the effect of gravity alone

Its value on the surface of the earth is 9 8 m/s2 ]
Time, t = 3 s
Using, v = u + at
=> v = 0 + (10)(3)
=> v = 30 m/s
This is the speed when the stone reaches the ground

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A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground? In some answers answered by experts, they write tht acceleration = 10m/s. But how do get 1om/s? It is not mentioned in the question!