Question

calculate the Work done in
saising a stone of mass 10 kg
through a velocity height of
5 m.
phy​

Answer 1

Answer:

10×9.8×5=490

Explanation:

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Answer 2

Answer:

⠀⠀⠀⌬ Initial Velocity (u) = 15 km/h

⠀⠀⠀⌬ Final Velocity (v) = 30 km/h

⠀⠀⠀⌬ Mass of the car (m) = 1000 kg

⠀⠀⠀⌬ Work Done = ?

• According to the Question :

⇒ Work = ∆KE

⇒ Work = K.E.(After) - K.E.(Before)

⇒ Work = ½mv² - ½mu²

⇒ Work = ½m(v² - u²)

⇒ Work = ½ × 1000 × [(30)² - (15)²]

⇒ Work = 500 × [(30 + 15)(30 - 15)]

⇒ Work = 500 × 45 × 15

⇒ Work = 337500 Joules

∴ The Work done is 337500 Joules.