Exercise Problems - I — task. Science State Board, Class 9.

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1. A ball is gently dropped from a height of 20 $m$ . If its velocity increases uniformly at the rate of 10

$m s^{- 2}$ , with

a. What velocity will it strike the ground?

b. After what time will it strike the ground?

Solution:

From the data given,

Acceleration (

$a$ )

$=$ 10

$m s^{- 2}$

Distance travelled by the ball (

$s$ )

$=$ 20

$m$

Initial velocity of the boat (

$u$ )

$=$

$0$

$m$

$/$

$s$ (Since it's start from the rest state)

From the Equation of motion - III, We know that,

$i^{i} = i^{i} + i i i$

Substituting the given values of

$u$ ,

$a$ and

$s$ in the above equation, we get

Velocity

$=$

$m s^{- 1}$

From the Equation of motion - I, We know that,

$i = i + i i$

Substituting the known values in the above equation, we get

Time

$=$

$s$

$1$

Did you find an error?

13. Exercise Problems - I