Physics, asked by prinkle1650, 11 months ago

Balls fall on the ground from height 98 m .what is time

Answers

Answered by priyankapriyanka1980
1

Answer:

4

seconds

Earth's acceleration due to gravity is 9.8m/s^2

this means that anything's velocity changes by 9.8m/s every second.

1s=t v=9.8 d

2s= t v=19.6

t=3s v=29.4

t=4s d=39.2

addition = 98

because 1st second it travel 9.8m

2nd second=19.6

and so on

Answered by kevg
0
The distance is 98 m. S
Acceleration is 9.8 m/s^2 .a
Find time .t
By third equation of motion
S=ut +1/2 at^2
Here u is initial velocity .
Initial velocity is 0 so the equ is
S=1/2 at^2.
Substitute the value,
98=1/2 *9.8*t^2

98= 9.8/2 *t^2

98= 4.9*t^2

98/4.9=t^2

20=t^2

4.5 sec =t

Ans 4.5 sec

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