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2 years ago

A student drops a ball from the top of a tall building; it takes 2.9 s for the ball to reach the ground.

Physics

1 answer:

AlexFokin [52]2 years ago

4 0

Initial velocity (u) = 0 m/s
Time taken (t) = 2.9s
Acceleration due to gravity (g) = + 10 m/s² [Down]

<h2><u>To calculate</u>,</h2>

Final velocity (v)
Height (h)

<h2><u>Solution</u><u>,</u></h2>

→ v = u + gt

→ v = 0 + 10(2.9)

→ v = 29 m/s $\qquad$ … ( Ans )

And,

→ h = ut + ½gt²

→ h = 0(2.9) + ½ × 10 × (2.9)²

→ h = 5 × 8.41

→ h = 42.05 m $\qquad$ … ( Ans )

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2 years ago

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3 years ago

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Answer:

Explanation:

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3 years ago

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2 years ago

Read 2 more answers

The info below shows three kettles with their powers and the time they take to boil 500cm3 of water. If electricity costs 9p per

Hitman42 [59]

The cost of boiling 500cm3 of water using the 3kW kettle is 1.35 P.

<h3>Cost of electricity for 3 kW kettle</h3>

The cost is calculated as follows;

1 unit = 9p /kWh

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E = 0.15 kWh

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Thus, the cost of boiling 500cm3 of water using the 3kW kettle is 1.35 P.

Learn more about energy cost here: brainly.com/question/13795167

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1 year ago