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harkovskaia [24]

2 years ago

15

A car initially miving at 0.5m/s along a track.the car come to rest after travelling 1m.the car is repeated on the same of track

,but car initial moving at 1m/s.How far does the car travel before come to rest?

1 answer:

cluponka [151]2 years ago

6 0

Answer:

it will travel 69 m long consuming. it is totally wrong

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g (12 points) The time between incoming phone calls at a call center is a random variable with exponential density p(x) = 1 r e

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2 years ago

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A Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of

ololo11 [35]

Answer:

The initial velocity is 50 m/s.

(C) is correct option.

Explanation:

Given that,

Time = 10 sec

For first half,

We need to calculate the height

Using equation of motion

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$h =\dfrac{v^2}{2g}$ ....(I)

For second half,

We need to calculate the time

Using equation of motion

$h =ut+\dfrac{1}{2}gt_{2}^2$

$h=0+\dfrac{1}{2}gt_{2}^2$

$t_{2}=\sqrt{\dfrac{2h}{g}}$

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According to question,

$t_{1}+t_{2}=10$

$t_{1}=t_{2}$

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$\dfrac{v}{g}+\dfrac{v}{g}=10$

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Here, g = 10

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Hence, The initial velocity is 50 m/s.

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