A stone is dropped from the top of a 40 m high tower. Calculate its speed after 2 s. Also find the speed with which the stone strikes the ground.
Answers
Answered by
92
Given that,
Height = 40 m
Time t =2 sec
We know that,
v=u+gt
v=0+9.8×2
v=19.6m/s
The speed of stone is 19.6 m/s
Now, the speed with which the stone strikes the ground
v=28m/s
Hence, the speed with which the stone strikes the ground is 28 m/s
Answered by
11
✤ Given :
Height = 40m
Time = 2 sec
✤ To Find :
It's speed after 2s.
The speed with which the stone strikes the ground.
✤ Solution :
Formulae used :
➤
where, u = 0 and a = g(acceleration due to gravity)
Substituting the values, we get,
:
:
The speed of the stone after 2s is 19.6 m/s.
After that, we have to find the stone strikes the ground,
Fomulae used :
➤
Substituting the values, we get,
:
:
:
:
:
Therefore, the speed with which the stone strikes the ground is 28m/s.
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