JEE MAIN - Physics (2019 - 10th January Evening Slot - No. 12)
A particle which is experiencing a force, given by $$\overrightarrow F = 3\widehat i - 12\widehat j,$$ undergoes a displacement of $$\overrightarrow d = 4\overrightarrow i $$ particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement ?
9 J
10 J
12 J
15 J
Explanation
Work done = $$\overrightarrow F \cdot \overrightarrow d $$
$$=$$ 12 J
work energy theorem
wnet $$=$$ $$\Delta $$K.E.
12 $$=$$ Kf $$-$$ 3
Kf = 15 J
$$=$$ 12 J
work energy theorem
wnet $$=$$ $$\Delta $$K.E.
12 $$=$$ Kf $$-$$ 3
Kf = 15 J
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