An automobile travels on a straight road for 40km at 30 km/hr. it then continues in the same director for another 40 km at 60 km/hr. (a) what is the average assume that it moves in the positive x direction.

Explanation:

Time taken by the car to move first 40 km distance

here we have

similarly the time taken by car to move next 40 km is given as

so total time of the motion is given as

total distance moved by the automobile

so the average speed is given as

i'm on my way to history not a mistory.

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j