4. For a freely falling body, vertical velocity at 5th second is:
a) 39.2 ms-1
b) 49 ms -1
c) 19.6 ms-1
d) 94.9 ms-1

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Research the neutrino using the internet and report your findings. in a nuclear decay, the nucleus of an atom splits apart. larger particles can be detected and their masses and velocities can be recorded. explain how the existence and properties of the neutrino could be predicted using the conservation laws.

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied