one more..plzzz help me......

1.we can calculate the force acting on the particle(electron and proton) in each case..F=qE.
acceleration a in each case a=F/m..
then from relation S=at²/2,we get the time taken.
the case will be similar as that of free fall under gravity,the only difference being that the time of fall is independent of mass in case of free fall under gravity,whereas in this case the acceleration and thus the time of fall will depend on the charge of the particle.

2.
Should be like this somewhat..

for x<0,10^x will be less than 1.
for greater values it will keep on increasing.
thus we get a curve as shown above.