A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy (in J) of the particle after it has travelled 3 m is ___________

Options

A. 2.5 J
B. 5 J
C. 6.5 J
D. 4 J

Answer

C

Explanation

KE of particle = work done by force = area under F–s curve `2 xx 2 + 1/2 xx(2 + 3) xx 1 = 6.5J`