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siniylev [52]
3 years ago
10

A skateboarder flies horizontally off a cement planter. After 3 seconds the skateboarder lands on the ground with a final veloci

ty of −4.5 m/s. Which kinematic equation would be most useful for finding the skateboarder’s initial velocity? (Assume a=−9.8 ms^2)
B
C or E
A
D

Physics
1 answer:
evablogger [386]3 years ago
3 0

Given the time, the final velocity and the acceleration, we can calculate the initial velocity using the kinematic equation A:

v = v_o + a \Delta t

A skateboarder flies horizontally off a cement planter. After a time of 3 seconds (Δt), he lands with a final velocity (v) of −4.5 m/s. Assuming the acceleration is -9.8 m/s² (a), we can calculate the initial velocity of the skateboarder (v₀) using the kinematic equation A.

v = v_o + a \Delta t\\\\v_o = v - a \Delta t = (-4.5 m/s) - (-9.8 m/s^{2} ) \times 3 s = 24.9 m/s

Given the time, the final velocity and the acceleration, we can calculate the initial velocity using the kinematic equation A:

v = v_o + a \Delta t

Learn more: brainly.com/question/4434106

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Answer:

D. If a home were wired in series, every light and appliance would have to be turned on in order for any light or appliance to work.

Explanation:

In a series circuit, all the appliances are connected on the same branch of the circuit, one after the other. This means that the current flowing throught them is the same. However, this means also that if one of the appliance is turned off (so, its switch is open), that appliance breaks the circuit, so the current can no longer flow through the other appliances either.

On the contrary, when the appliances are connected in parallel, they are connected in different branches, so if one of them is switched off, the other branches continue working unaffacted by it.

6 0
3 years ago
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What happens when the crests of two waves overlap
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4 0
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A student evaluates a weight loss program by calculating the number of times he would need to climb a 14.0 m high flight of step
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Answer:

400 trips

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7 0
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What force gives a 1.0 kg mass an acceleration of 7.0 m/s^2?​
TiliK225 [7]

For this case we have that according to Newton's second law it is true that:

F = m * a

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F: It is the force

m: It is the mass

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According to the data we have:

m = 1.0 \ kg\\a = 7.0 \frac {m} {s ^ 2}

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Thus, the applied force will be 7 Newtons.

Answer:

F = 7 \ N

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