A particle of mass m=5x10^-27 kg has an initial speed of 2x105 m/s. The particle travels in a straight line and its speed increases to 4x10^5 m/s on a distance of 10 cm. Assuming that the acceleration is constant, the
force exerted on the particle is:
3x10^-15 N
3x10^-20 N
8.65x10^-23N
1.73x10^-22 N