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CBSE - IX - Physics - Gravitation

A bear fell down from a pole 20m high,suddenly he fell down from there, he reaches the ground in 2s. CAN YOU TELL ME WHAT IS THE COLOR OF THE BEAR??

Asked by DHIRENDRA 24th October 2017, 5:14 PM
Answered by Expert


From Kinematic equations of motion
begin mathsize 12px style straight s equals ut plus 1 half gt squared
20 equals 0 xt plus 1 half gx 2 squared
20 equals 1 half gx 4
straight g equals 10 space straight m divided by straight s squared end style
Value of g on the surface of the earth is different at all point because of the shape of the earth which is oval.
In general, we take g=9.8 m/s2 which is an average or estimated value
g is maximum on poles and minimum on the equator
Since we get here g=10 m/swhich approximately equal to maximum value of g on poles i.e. g= 9.832 m/s2 
So the bear belongs to the polar region, where you can polar bear which is white in color
Answered by Expert 4th December 2017, 1:14 PM

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