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Vladimir79 [104]

3 years ago

9

You climb to the top of a ladder. You drop a a ball from height H, it reaches the ground with speed V if there is no air resista

nce. From what height should you drop it so it will reach the ground with three times the original speed?
√3H
H
6H
9H

(pls help its due today)

1 answer:

olchik [2.2K]3 years ago

6 0

Answer:

heymelissa its amanda i hate ms spearman

Explanation:

yuh

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The British attempted to break the land-speed record and the sound barrier using a jet-powered car. They made their attempt in t

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Your answer is B.

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A rock is thrown from a bridge at an angle 30∘ below horizontal.immediately after the rock is released, is the magnitude of its

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3 years ago

If it takes a ball dropped from rest 2.261 s to fall to the ground, from what height H was it released? Express your answer in m

algol [13]

Answer:

Height, H = 25.04 meters

Explanation:

Initially the ball is at rest, u = 0

Time taken to fall to the ground, t = 2.261 s

Let H is the height from which the ball is released. It can be calculated using the second equation of motion as :

$H=ut+\dfrac{1}{2}at^2$

Here, a = g

$H=\dfrac{1}{2}gt^2$

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An 88 kg worker stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale reads 900 N. Fi

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Answer:

The magnitude is "3.8 m/s²", in the upward direction.

Explanation:

The given values are:

Mass,

m = 88 kg

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On substituting the given values, we get

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Now,

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On substituting the given values in the above equation, we get

⇒ $900=862.4-9.8 a$

On subtracting "862.4" from both sides, we get

⇒ $900-862.4=862.4-9.8 a-862.4$

⇒ $37.6=-9.8a$

⇒ $a=-\frac{37.6}{9.8}$

⇒ $a=3.8 \ m/s^2$ (upward direction)

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Answer:

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