A brick falling freely from a helicopter drops 40 meters during a certain 1-second time interval. The distance it will fall in the next second is
A. 56
B. 45
C. 80
D. 50

Question

A brick falling freely from a helicopter drops 40 meters during a certain 1-second time interval. The distance it will fall in the next second is
A. 56 
B. 45 
C. 80 
D. 50

shivaniits · Answer

but if we take account of the distance it has travelled in 1 sec it would define its velocity..i.e if its travelling 40 m in 1 sec then its initial velocity could be taken as u=40m/s
$$a=10m/s ^{2}$$
t=1 sec
then acc to relation $$s=ut+1/2at ^{2}$$
we would get $$s=40(1)+1/2\times10(1)^{2}=40+5=45m$$

shivaniits · Answer

that's why i am considering the initial velocity u to be 40m/s as v is changing wrt to acceleration(gravity) at 10m/s^2..and measuring the distance regarding it!!

shivaniits · Answer

i have considered v as final velocity that depend on time duration at which we are supposed to calculate it..

shivaniits · Answer

i have not considered the average velocity i have only considered the initial velocity that we require in the relation
$$s=ut+1/2at ^{2}$$
where u=initial velocity

shivaniits · Answer

so are we here looking for the distance in nth second or n seconds..??

shane_b · Answer

I finally get what you're saying.  Yes, the answer is 50m.

shivaniits · Answer

i got it the answer is 50...!!..thanks @demitris