3 years ago

A rock was dropped off a cliff from rest. It accelerated downward at 9.8m/s2

Physics

1 answer:

ValentinkaMS [17]3 years ago

6 0

Answer:

45.1 m/s

Explanation:

use the equation v = u + at

substitute the values v = 0 + 9.8×4.6

v = 45.08

round to 3 s.f v = 45.1 m/s

You might be interested in

One kg of air is contained in a piston-cylinder system and it undergoes a Carnot cycle having an efficiency of 60%.The heat tran

wlad13 [49]

Answer is in the file below

tinyurl.com/wtjfavyw

4 0

3 years ago

The spherical side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the m

svlad2 [7]

Answer:

(D) 0.99 cm

Explanation:

Given that the radius of curvature of the mirror is 25 cm.

And another car is following which is behind the mirror of 20 m.

$u=20m=2000cm$

Focal length is half of the radius of curvature and it is negative for convex lens.

Now the mirror formula.

$1/v+1/u=1/f$

So,

$1/v+1/2000=-1/(25/2)\\1/v=-1/2000-1/12.5\\v=-12.422cm$

Now

Magnification is,

$m=-v/u$

So,

$m=12.422/2000=0.00621$

So, Height of the image

$mh=0.00621\times 1.6 m\\mh=0.0099m\\mh=0.99cm$

Therefore, the image height is 0.99 cm.

4 0

4 years ago

The name of the Sl unit for force is the ___?<br><br> A. Joule<br> B. Newton<br> C.Watt

tiny-mole [99]

Answer:

the name of the SI unit for force is the newton

8 0

3 years ago

Read 2 more answers

The instruments carried by a spacecraft are called the

Sedaia [141]

I believe the answer is C- payload

6 0

3 years ago

Read 2 more answers

1. Sang Hee rubs a balloon on her hair until, when she holds the balloon several inches from

vodomira [7]

The reason why Kim's hair rises and sticks out is due to electrostatic attraction.

<h3>What is charging by friction?</h3>

We know that one of the ways in which a body is able to acquire static charges is by friction. When a body is rubbed against another, there could be loss or gain of charges leaving a net charge on each body.

The process that occurs when some of Kim's hair rises and sticks out toward the balloon, even though the balloon hasn't touched her hair is electrostatic attraction.

Learn more about charging by friction:brainly.com/question/9201910

#SPJ1

7 0

2 years ago