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3 years ago

How to calculate kinetic energy of a projectile at the highest point of a projectile?

2 answers:

6 0

Kinetic energy is half the product of the mass and the square velocity and at highest point the velocity is 0 thus the kinetic energy is 0 J

DIA [1.3K]3 years ago

3 0

For a projectile the total energy is equal to the kinetic energy that is 1/2 mv and the the potential energy mgh that add. Initially the total energy is all kinetic energy at the highest point the energy is all potential.so kinetic energy at that point is 0.
hope it helps

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A 6 kg box with initial speed 5 m/s slides across the floor and comes to a stop after 1.9 s. What is the coefficient of kinetic

Ilia_Sergeevich [38]

Answer:

$\mu_k=0.27$

Explanation:

According to the free body diagram, in this case, we have:

$\sum F_x:-F_k=ma\\\sum F_y:N=mg$

Recall that the force of friction is given by:

$F_k=\mu_k N$

Replacing and solving for the coefficient of kinetic friction:

$-\mu_kN=ma\\-\mu_k(mg)=ma\\\mu_k=-\frac{a}{g}$

We have an uniformly accelerated motion. Thus, the acceleration is defined as:

$a=\frac{v_f-v_0}{t}\\a=\frac{0-5\frac{m}{s}}{1.9s}\\a=-2.63\frac{m}{s^2}$

Finally, we calculate $\mu_k$ :

$\mu_k=-\frac{-2.63\frac{m}{s^2}}{9.8\frac{m}{s^2}}\\\mu_k=0.27$

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3 years ago

A car is traveling at 20 km in 15 minutes. What is its average velocity

yarga [219]

The velocity is 4374.45 m/s.
I got the answer by using v=d/t.
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2 years ago

Gaussian surfaces A and B enclose the same positive point charge. The area of surface A is two times larger than that of surface

svlad2 [7]

Answer:

The total electric flux through the two surfaces is equal.

Explanation:

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3 years ago

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Answer:

Here we do not have the vector, but I will try to give a kinda general solution to this type of problem.

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F = √( a^2 + b^2 + c^2)

wich gives us the total magnitude of the force, but not a direction or anything like that, this is just a scalar.

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IS any one going to answer this I need the answer also
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