Answer:
2 poles
Explanation:
We are told Agent Bond is standing on a bridge, 17 m above the road below.
Now, the bed of the truck is 1.5 m above the road.
It means the distance hewill need to fall = 17 - 1.5 = 15.5 m
acceleration due to gravity = 9.8 m/s²
Initial velocity = 0 m/s
Thus, to find the time, we will use the equation;
s = ut + ½at²
Plugging in the relevant values gives;
15.5 = 0 + ½9.8t²
Multiply through by 2 to give;
15.5 × 2 = 9.8t²
31 = 9.8t²
t² = 31/9.8
t = √(31/9.8)
t = 1.78 sec
We are told that he spots a flatbed truck approaching at 28 m/s and that the telephone poles are 22m apart.
Thus; The truck will pass the poles at a rate of; Velocity/distance between poles = 28/22 = 1.273 poles per second
Since, we got the time to be 1.78 seconds, then we can find the number of poles by multiplying it with the rate of poles per seconds.
Thus;
Number of poles = 1.78 second × 1.273 poles/ seconds = 2.27 poles
This is approximately 2 poles
