q 4 sdecond part

Asked by nilesh.dhote74 | 28th Apr, 2020, 06:32: PM

Expert Answer:

A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate: (i) the loss in potential energy of the body, (ii) the total energy possessed by the body at any instant? 
 
g = 10 m/s2 
 
i right parenthesis space M a s s space o f space b o d y comma space M space equals space 5 space k g space
P o t e n t i a l space e n e r g y space a t space h e i g h t space h space equals space 10 space m space i s comma space
P. E space a t space 10 space m space equals space m g h space equals space 5 cross times 10 cross times 10 space equals space 500 space J space

P. E space a t space 4 space m space equals space m g h space equals space 5 cross times 10 cross times 4 space equals space 200 space J space

L o s s space i n space P. E. space equals space 500 space minus space 200 space equals space 300 space J space

i i right parenthesis space T o t a l space e n e r g y space p o s s e s s e d space b y space b o d y space a t space a n y space i n s tan t space r e m a i n s space c o n s tan t space f o r space f r e e f a l l. space
I t space i s space s u m space o f space p o t e n i a l space e n e r g y space a n d space K. E space

A t space h e i g h t space 10 space m comma space i. e. space t o p m o s t space p o i n t comma space
K. E. space equals space 0

T h u s space t o t a l space e n e r g y space equals space P. E. space plus space K. E. space equals space 500 space J space plus 0 space equals space 500 space J space

Answered by Shiwani Sawant | 28th Apr, 2020, 11:20: PM