Question

31. In an experiment to measure the height of bridge by dropping stone into water underneath,
if the error in measurement of time is 0.1S, at the end of 2 S, then the error in the estimation
of height of bridge will be
(a) 0.49 m
(b) 0.98 m
(c) 1.96 m
(d) 2.12 m​

Answer 1

Explanation:

Answer

21gt2=H

differentiation 

21×g×(2t)×dt=dH

gtdt=dH

dt= error in time

dx=cross in H

9.8×2×101=dH

1.96=dH