Question

A stone droped from point A from certain height on a ground, takes 3 seconds to reach to the ground, the velocity with whites to the ground
will be
Options
O 44.145 m/s
29.43 m/s
O 0 m/s
O 3 m/s
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Answer 1

Answer:

v=90m/s

h=45m

Step-by-step explanation:

t=3sec.

u=0m/s

a=g=10m/s

v=u+gt

v=0+10×3²

v=10×9

v=90m/s

h=ut+½gt²

h=0×3+½×10×3²

h=0+5×9

h=45m

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Answer 2

Given:

A stone dropped from point A from certain height on a ground, takes 3 seconds to reach to the ground

t = 3 sec

To Find:

The velocity with which it hits the ground

Solution:

as given,

t = 3 sec

u = o

a = g = 9.81 m/s²   { as it falling due to gravity }

according to the first equation of motion

v = u + at

where,

v is final velocity,

u is initial velocity,

t is the time taken.

v = 0 + 9.81 × 3

v =  29.43 m/s

Hence, the velocity with which it hits the ground is 29.43 m/s.