class 9 questions of physics
chapter - motion
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que 9. a) Not possible,if there is no velocity then there is no acceleration because acceleration is rate of change of velocity
b) yes possible, when a stone tied to a string is whirled in a circular path then the acceleration always acts on it perpendicularly
que 10.Distance covered by the satellite in 24 hours
s=2πr
=2×3.14×42250=265464.58 km
Therefore speed of satellite, v=
distance travelled /time taken =
265464.58 /24×60×60 =3.07 km/ s
Explanation:
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