Question

Q.39
The values of kinetic energy K and potential energy U are
measured as follows:
K= 100.0 2.0 J, U= 200.0 1.0 J. Then the percentage
error in the measurement of mechanical energy is -
(A) 2.5%
(B)1%
(C) 0.5%
(D) 1.5%
​

Answer 1

Answer:

Total energy E = K+U

dE/E= dK/K + dU/U

= (2/100 + 1/200) ×100

= 2.5%