Question

ⓗⓔⓨ ⓕⓡⓘⓔⓝⓓⓢ


============================


1) A man of mass 20 kg climb up a ladder in 20 secs. If the height of the ladder is 10 meter. what is the power used ????


CLASS 9 .... WORK AND ENERGY


$no \: spamming$


$<marquee > prabhudutt$

Answer 1

HERE IS UR ANS :-

Power is defined at as work done per unit time.

Work done = Change in potential energy.

= mg(h2-h1)

= 20x10x(10-0)

= 2000J

Power = 2000/20

= 100 w

HOPE THIS MAY HELP U :-)

Answer 2

work done = f×d
d=10m
f=ma
=20×10=200N
work done=200×10=2000jule
power=work done/time
=2000/20=100W
your answer