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Alja [10]
2 years ago
13

Calculate the speed of a car that traveled 200 kilometers in 3 hours.

Physics
2 answers:
nignag [31]2 years ago
8 0

Answer:

The units (km/h) tell you how to do this! 200km/3h = 66.66666666…. BUT technically you only have ONE significant digit: 3 so 66.666… rounded to ONE digit is 70km/h but that is probably not important in this intro class so V = 66.67 or 67 km/h

Kamila [148]2 years ago
7 0

Answer:

66.7km/h

Explanation:

s=d/t

200/3

=66.6666666

round off: 66.7km/h

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Answer:

X(t) = 9.8 *t - 4.9 * t^2

Explanation:

We set a frame of reference with origin at the hand of the girl the moment she releases the ball. We assume her hand will be in the same position when she catches it again. The positive X axis point upwards.The ball will be subject to a constant gravitational acceleration of -9.81 m/s^2.

We use the equation for position under constant acceleration:

X(t) = X0 + V0 * t + 1/2 * a *t^2

X0 = 0 because it is at the origin of the coordinate system.

We know that at t = 2, the position will be zero.

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Then the position of the ball as a function of time is:

X(t) = 9.8 *t - 4.9 * t^2

5 0
2 years ago
An object moving at a velocity of 32 m/s slows to a stop in 4 seconds. What was its acceleration
Leya [2.2K]

Answer:

8

Explanation:

Because you divide 32/4 which gives you 8.

6 0
3 years ago
A 49-year-old female was referred for mammography, but she is very apprehensive after reading about the risk of ionizing radiati
SOVA2 [1]

Answer:

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In this way radiographer should handle the situation.

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