A ball is thrown vertically upwards and reaches the height 20m .Caluculate the initial speed.
Please answer.
Answers
Answered by
1
Answer:
In the case of vertically projected bodies
initial velocity=u
final velocity =0
height travelled =h
based on the kinematics equation ,
v^2-u^2=2as
s=h
0^2-u^2=2(-g)h
u=√2gh
so,try to substitute in the formula
u=√2.10.20
u=√400
=20m/s
Explanation:
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Answered by
1
Answer:
The initial speed is 20m/s
Explanation:
Initial speed , u = ? ; Final speed , v = 0 ;
Height , h =20 m ; g =9.8 m/s
v²=u²+2gh
=>(0)² = u² + 2×(-9.8)×20
=>0 = u² -392
=>u²= 392
=>u = 19.8
=>u = 20 m/s
Hope this answer helps you out.
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