3 times 6= 18. The average speed is 19 mph.
hope this helps!
Answer:
500000000 lbft/s
Explanation:
F = Force or weight = 1000000 lbf
s = Displacement = 10000 ft
t = Time taken = 20 seconds
Work done is given by

Power is given by

One Saucer power is 500000000 lbft/s
Answer:
The helicopter was 1103.63 meters high when the package was dropped.
Explanation:
We consider positive speed as a downward movement
y: height (m)
t: time (s)
v₀: initial speed (m/s)
Δy = v₀t +
gt²
Δy= 15
×15 s +
×9.81
×(15 s)²
Δy= 1103.63 m
By the work energy theorem, the total work done on the stone is given by its change in kinetic energy,

We have


Then the total work is
