Question
Thu January 03, 2013

# distance cannot be negative, but according to new cartesian system the distance of object(since kept on left) is taken negative.why is it so?

Expert Reply
Fri January 04, 2013
The negative sign is taken just to signify that the distance to the object is measured in the direction opposite to that of light.
For eg., consider a number line. Lets assume that the mirror is placed at such a position that its pole lies at the zero point of the number line, object is placed on the negative side and light enters the lens from the negative side. Then in such a case the distance to the object (measurd from pole) is taken as negative.
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Fri May 19, 2017

# A hot-air balloon is rising vertically with a constant velocity of 10 m/sec. An object is dropped from the balloon when it is 60 m above the ground. The angle of elevation of the Sun is 45o. When the falling object is 33.75 m from the ground, the rate at which the shadow of the object is traveling along the ground is (take g = 10 m/sec2) (A) 15 m/sec. (B) 20 m/sec. (C) 25 m/sec. (D) 30 m/sec. Please give Detailed Solution.

Tue March 21, 2017

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