Answer:
(a) It depends on what cruising speed and cruising altitude
(b) 
(c) 
Explanation:
Formula for Kinetic energy: 
Formula for Potential energy 
(a) It actually depends on cruising speed and cruising altitude to tell which one requires more energy. However, cruising speed would have more impact than cruising altitude because it has a power of 2 in the energy formula.
(b) If we plug in v = 270 and m = 210000 to the Kinetic energy formula we should have
(c) If we plug in h = 10.4 km = 10400 m, m = 210000 and g = 9.81 we should have
Answer:a
Explanation:
We have to lift the load two loads up one story, so energy required is
let m be the mass of each load and h is the height of each story
Energy 
Here energy gained is the potential energy which depends upon the datum(floor).
For lifting one load up one story
Energy required
thus 
is half of 
So option a is correct
Answer:
33.33 m/s
Explanation:
m = 450 kg. T = 5000 N, t = 3 seconds,
let the net acceleration is a.
T = m a
a = 5000 / 450 = 11.11 m/s^2
u = 0 , v = ?
Let v be the velocity after 3 seconds.
Use first equation of motion
v = u + a t
v = 0 + 11.11 x 3 = 33.33 m/s
The slope of an object is given relative to an origin.
I believe it’s just a “v” with an arrow above it.
