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IgorLugansk [536]
3 years ago
5

A 75-kg refrigerator is located on the 70th floor of a skyscraper (300meters a over the ground) What is the potential energy of

the refrigerator?
#PLEASE HELP
Physics
1 answer:
Nata [24]3 years ago
7 0
Formula for potential energy is V=mgh, where m is mass in KG, g is earth acceleration (10 m/s^2), and h its height in meters. We know mass, acceleration is constant and also known, we know height also. Lets substitute
V=75*10*300=225000[J]=225[kJ] - its the answer
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Answer:

s = 589.3 m

Explanation:

Let the truck and car meet at a distance = s  m

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car:

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a = 3.9 m/s²

s = Vi* t + 1/2 a t²

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compare equation (1)  and equation (2)

s= v * t = 1/2 a t²

⇒ v * t = 1/2 a t²

⇒ t = 2 * v/ a

⇒ t = (2 * 33.9 )/ 3.9

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Now

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You should select Choice-4 .

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Δt = ?

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