Can you please help me answer the following questions. I really need them and I will rate. 1. A certain type of elementa

[answerhappygod]

Can you please help me answer the following questions. I really
need them and I will rate.
1. A certain type of elementary particle travels at a speed
of 2.80×108 m/s . At this speed, the average lifetime is measured
to be 4.66×10−6 s . What is the particle's lifetime at rest?
2. What is the value of e/me/m for a particle
that moves in a circle of radius 12 mm in
a 0.89-T magnetic field if a
perpendicular 680-V/m electric field will make the path
straight? Express your answer using two significant
figures.