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?

Answer 1

Answer:

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Answer 2

Answer:

The velocity of the ball the instant before it hits the ground is $30 m/sec^{2}$.

Explanation:

• The velocity is defined as when the rate of the change of any object’s position it is due to reference and the time.
• It has a vector Quantity of both magnitude and direction.
• The SI unit is meter per second. It is denoted by $ms^{-1}$.

• There are two types of velocity. They are:

1) Initial Velocity.

2) Final velocity.

3) constant velocity.

• When the object is moved it tends to become zero.
• It is called as rate of change of its displacement.

Given that:

u =0

a = g

Time (t) = 3.0 sec

To find:

The velocity of of the ball the instant before it hits the ground =?

Solution:

Formula to find the velocity:

V = u+at

Here ,

u= 0, a=g, t =3

By putting the values, we get,

= 0+g*3

= 3*10

= 30 m/s square.

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