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postnew [5]
3 years ago
9

Two stones, one of mass m and the other of mass 2m, are thrown directly upward with the same velocity at the same time from grou

nd level and feel no air resistance. Which statement about these stones is true?
a. The heavier stone will go twice as high as the lighter one because it initially had twice as much kinetic energy.
b. Both stones will reach the same height because they initially had the same amount of kinetic energy.
c. At their highest point, both stones will have the same gravitational potential energy because they reach the same height.
d. At Its highest point, the heavier stone will have twice as much gravitational potential energy as the lighter one because it is twice as heavy.
e. The lighter stone will reach its maximum height sooner than the heavier one.
Physics
1 answer:
brilliants [131]3 years ago
8 0

Answer:

c.  At their highest point, both stones will have the same gravitational potential energy because they reach the same height.

Explanation:

The above statement is true going by the fact that, the gravitational potential energy of both stones is a function of its mass (weight) as well as the height at which it reach. <em>Despite the fact that, both stones has different weights, it would reach different heights. At their various maximum height, the will have same potential energy.</em>

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A 1280 kg car is moving 4.92 m/s. a 509 N force then pushes it forward for 28.7 m. what is its final KE?(unit=J)PLEASE HELP
laila [671]

Answer:

The answer to your question is: total energy = 30100.4 J

Explanation:

Kinetic energy (KE) is the energy due to the movement of and object, its units are joules (J)

Data

mass = 1280 kg

speed = 4.92 m/s

Force = 509 N

distance = 28.7 m

Formula

KE = \frac{1}{2} mv^{2}

Work = Fd

Process

- Calculate Kinetic energy

- Calculate work

- Add both results

KE = \frac{1}{2} (1280)(4.92)^{2}

KE = 15492.1 J

Work = (509)(28.7)

Work = 14608.3 J

Total = 15492.1 + 14608.3

Total energy = 30100.4 J        

8 0
3 years ago
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Distance for which the bike is ridden = 30 km
Speed at which the bike is driven = 0.75 km/minute
Let us assume the number of minutes taken to travel the distance of 30 km = x
Now we already know the formula of speed can be written as
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So the time taken for riding a distance of 30 km will be 40 minutes. I hope this procedure is simple enough for you to understand.
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Answer:

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Explanation:

Notation

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