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5.Work, Energy, Power and Collision
medium
$2kg$ ના પદાર્થને $490 J$ ગતિઊર્જાથી ઉપર ફેંકવામાં આવે છે.તો ................. $\mathrm{m}$ ઊંચાઇએ ગતિઊર્જા અડધી થાય?
A
$50$
B
$12.5$
C
$25 $
D
$10$
Solution
(b)Let h is that height at which the kinetic energy of the body becomes half its original value
i.e. half of its kinetic energy will convert into potential energy $mgh = \frac{{490}}{2}$
==> $2 \times 9.8 \times h = \frac{{490}}{2}$
==> $h = 12.5m.$
Standard 11
Physics
