Kathy tests her new sports car by racing with stan, an experienced racer. both start from rest, but kathy leaves the starting line 1.00 s after stan does. stan moves with a constant acceleration of 3.4 m/s2 while kathy maintains an acceleration of 4.49 m/s2. (a) find the time at which kathy overtakes stan. 6.7 correct: your answer is correct. seenkey 6.7 s from the time kathy started driving

time at which Kathy overtakes Stan is 6.70 sec

Explanation:

given data

time = 1 sec

acceleration= 3.4 m/s²

acceleration = 4.49  m/s²

to find out

the time at which Kathy overtakes Stan

solution

we consider here travel time for kathy = t1

and travel time for stan is = t2

and we know initial velocity = 0

so

t1 = 1 + t2

and distance travel equation by kinematic is

d1 = ut + at²

d1 = 0+   4.49 (t2)²   ................1

and

d2 = 0 + 3.4 (1+t2)²   ..................2

and when overtake distance same so  from equation 1 and 2

4.49 (t2)²  = 3.4 (1+t2)²

t2 = 6.703828 sec

so time at which Kathy overtakes Stan is 6.70 sec

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge