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4 years ago

6

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time th

e acceleration of the ball is always
A) in the direction of motion.
B) opposite its velocity.
C) directed upward.
D) directed downward.

1 answer:

kozerog [31]4 years ago

3 0

Answer: D) directed downward.

Explanation:

We know that the constant acceleration of $9.87ms^{-2}$ of every-thing is always DIRECT DOWNWARDS because of the to the influence of the gravity of the Earth.

This motion is denoted as free fall motion , where the acceleration due to the gravity is constant $9.87ms^{-2}$ .

∴ A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always directed downward.

Hence, the correct answer is D) directed downward..

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Stels [109]

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(b) Average acceleration,

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Here, v is final velocity and u is the initial velocity and $\Delta t$ is the time interval.

As twelve seconds later, the car is halfway around the track and traveling in the opposite direction with the same speed, therefore

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3 years ago

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3 years ago

It takes Harry 34 s to walk from x1 = -11 m to x2 = -54 m .

miss Akunina [59]

Missing question:
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Solution
The relationship between velocity (v), space (S) and time (t) is
</span> $v= \frac{S}{t}$
<span>The space covered by Harry is
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4 0

4 years ago

A bomb of mass 6kg initially at rest explodes into two fragments of masses 4kg and2kg respectively. If the greater mass moves wi

uysha [10]

Answer:

v = 10 [m/s].

Explanation:

The largest mass is that of 4 [kg], in this way the momentum can be calculated by means of the product of the mass by velocity.

$P=m*v\\$

where:

P = momentum [kg*m/s]

m = mass = 4 [kg]

v = velocity = 5 [m/s]

Now the momentum:

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This same momentum is equal for the other mass, in this way we can find the velocity.

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3 years ago

Can somebody help please !!!!

Nataly [62]

Vector A is of magnitude 12 m and it makes an angle of 37 degree with Y axis

So here we can say that

$\frac{A_x}{A} = sin37$

$A_x = A sin37$

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$A_x = 7.22 m$

Similarly we have

$\frac{A_y}{A} = cos37$

$A_y = A cos37$

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So here we have

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option A is correct

3 0

3 years ago