Which radtation was the weakest radiation in earth?

Alpha Particles

Explanation:

Alpha particles are the weakest radiations present on Earth, as they can easily be deflected by less dense particles. They are made up of further subatomic particles that make them heavy and increase their ionising power.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2