Answer:
122.17 m/s
Explanation:
x cos 40 = horizontal velocity
1500 m / x cos 40 = time in the air =<u> 1958.11 / x</u>
x sin 40 = vertical velocity
find when shell vertical velocity = 0 (this is max height....1/2 way through its flight) , the time when it hits the ground will be twice this...
0 = x sin 40 - 9.8 t
t = x sin40 / 9.8 time in the air is twice this = .13118<u> x</u>
<u />
Equate the two times from above to solve for x
1958.11/ x = .13118 x
x = 122.17 m/s
The mass of the car is 2000 kg
Explanation:
We can solve this problem by using Newton's second law of motion, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

where
is the net force
m is the mass
a is the acceleration
In this problem, we have:
is the acceleration of the car
Each person applies a force of 400 N, and there are five men, so the total force applied is

Therefore, the mass of the car is:

Learn more about Newton's second law of motion:
brainly.com/question/3820012
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Answer:
A soma dos dois tipos de energia, potencial e cinética, resultam na energia mecânica. Ou seja, ambas compõe a energia mecânica.