Question

A stone is thrown vertically upwards to the height of 20m . find its initial velocity [ value of acceleration due to gravity = 10ms^-2 ]
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CLASS 9TH PHYSICS CH 8 NCERT ​

Answer 1

Answer:

v=20,u=?,a=10ms^-2

S=ut+1/2at^-2 formula is used where is t=time

Answer 2

Answer:height=u^2/2g

u= initial velocity

given h=20m

hence 20=u^2/20

u^2=400

u=20

Explanation: