Question

A moving electron has KE ‘K’. When a certain amount of work is done, it moves with one quarter of its velocity in opposite direction. Find the work in terms of K.

• A. $\frac { - 15 } { 16 } K$
• B. $\frac { - 17 } { 16 } \mathrm {~K}$
• C. $\frac { - 5 } { 4 } \mathrm {~K}$
• D.

Answer 1

Answer: (B)

$\frac { - 17 } { 16 } \mathrm {~K}$

Answer 2

$\frac { - \mathrm { K } } { ( 4 ) ^ { 2 } } = \mathrm { K } + \mathrm { W }$ or W = $\frac { - 17 } { 16 }$K