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Phoenix [80]
3 years ago
13

What’s the velocity for 3.5 seconds?

Physics
2 answers:
antoniya [11.8K]3 years ago
8 0

Answer:

Acceleration = delta velocity/delta time a = 70 m/s/35 seconds = 2 m/s2

Explanation:

Illusion [34]3 years ago
7 0

Answer:

After 3 seconds, the velocity is 4.5+3×1.5=9 m/s.

Explanation:

hope it helps

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When a ball is thrown straight up with no air resistance, the acceleration at its highest point. A) is upward B) is downward C)
Illusion [34]

Answer:

B) is downward

Explanation:

The acceleration is always downward, because it is the gravitational acceleration.

When the ball is going up the acceleration is opposing the movement, and when the ball is going down the velocity has the same direction as the acceleration

7 0
4 years ago
A constant force of 120 N pushes a 55 kg wagon across an 8 m level surface. If the wagon was initially at rest, what is the fina
Illusion [34]

Answer:

The kinetic energy of the wagon is 967.0 J

Explanation:

Given that,

Force = 120 N

Mass = 55 kg

Height = 8 m

We need to calculate the kinetic energy of the wagon

Using newtons law

F = ma

\dfrac{120}{55}=a

a =2.2\ m/s^2

Using equation of motion

v^2 =u^2+2as

Where,

v = final velocity

u = initial velocity

s = height

Put the value in the equation

v^2=0+2\times2.2\times8

v=5.93\ m/s

Now, The kinetic energy is

K.E=\dfrac{1}{2}mv^2

K.E=\dfrac{1}{2}\times55\times(5.93)^2

K.E=967.0\ J

Hence, The kinetic energy of the wagon is 967.0 J

3 0
3 years ago
What happens during the apparent retrograde motion of a planet?
anygoal [31]

Answer:

The planet will move from east to west for a couple of months in the night sky.

Explanation:

Retrograde motion is an optical effect due to the fact that Earth rotates more quickly than the planet that apparently has a retrograde motion in the sky.

For example, Saturn has a slower speed in its orbit around the Sun. That means that the Earth will pass it, and that will give the effect that the planet is moving backward. That same scenario can be seen between two cars on a highway, the faster car will see the slower car when it passes as it is moving for a short fragment of time in backward.

Remember that the planets in the night sky move from west to east, in the case of a planet with retrograde motion, it will move from east to west for a couple of months.

6 0
3 years ago
1. Two students have volunteered to explore the galaxy in a
LiRa [457]

Answer:a

Explanation:

I guess

7 0
3 years ago
How will decreasing the amplitude of the sound waves from a television affect its intensity?
Colt1911 [192]

A. The sound will decrease in volume

6 0
4 years ago
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