After 5 seconds the stone will have fallen 49 m
Answer:

Explanation:
given,
charge = -5.0 μC
Electric force, F = 11 i^ N
force would a proton experience = ?
we know



we know charge of proton is equal to 1.6 x 10⁻¹⁹ C
using formula



Force experienced by the photon in the same field is equal to 
Answer:
Explanation:
Cutting a string in half because
b is irreversible
c is a cheical and d is also a chemical change