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Vlada [557]
4 years ago
9

Ball A is dropped from rest from a window. At the same instant, ball B is thrown downward; and ball C is thrown upward from the

same window. Which statement concerning the balls after their release is necessarily true if air resistance is neglected?
(a) At some instant after it is thrown, the acceleration of ball C is zero.
(b) All three balls strike the ground at the same time.
(c) All three balls have the same velocity at any instant.
(d) All three balls have the same acceleration at any instant.
(e) All three balls reach the ground with the same velocity.
Physics
1 answer:
lesantik [10]4 years ago
3 0

Answer:

d) The three balls experience the same acceleration, the gravitational acceleration of 9.8 m/s2.

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3 years ago
A 1400-kg car is moving at a speed of 25m/s. how much kinetic energy does the car have?
Luba_88 [7]

Answer:

437.5Kjoules

Explanation:

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3 0
3 years ago
A block of mass 5 kg is placed on a rough table having a coefficient of static friction μs = 0.2.What is the force required to m
just olya [345]

Answer:

<em>We need to (at least) apply a force of 9.8 N to move the block</em>

Explanation:

<u>Second Newton's Law</u>

If a net force F_n different from zero is applied to an object of mass m, then it will move at an acceleration a, given by

F_n=ma

If we apply a force F to an object placed on a rough surface, the only way to make it move is to beat the friction force  which is given by

F_r=\mu F_N

Where \mu is the static friction coefficient and F_N is the normal force exerted by the table to the object. Since there is no motion in the vertical direction the normal force equals the weight of the object:

F_N=mg=5\ kg\ 9.8\ m/s^2=49\ N

The friction force is

F_r=0.2 (49)=9.8\ N

Thus, we need to (at least) apply a force of 9.8 N to move the block

5 0
4 years ago
¿Alguien que me pueda dar las respuestas a las siguientes preguntas?
taurus [48]
Anskskskskskdbdbdbds
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