3 years ago

If you run 12 km at an average speed of 4 km/h, how much time does it take?

Physics

1 answer:

Shtirlitz [24]3 years ago

4 0

Answer:

3 hours, I think

Explanation:

You might be interested in

What’s the ion of element iodine ?

Kipish [7]

The ion of idodine is neutral

3 0

3 years ago

A cannon is mounted on a tower above a wide, level field. The barrel of the cannon is 20 m above the ground below. A cannonball

OLga [1]

<u>Answer:</u>

Cannonball will be in flight before it hits the ground for 2.02 seconds

<u>Explanation:</u>

Initial height from ground = 20 meter.

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this the velocity of body in vertical direction = 0 m/s, acceleration = 9.8 $m/s^2$ , we need to calculate time when s = 20 meter.

Substituting

$20=0*t+\frac{1}{2} *9.8*t^2\\ \\ t = 2.02 seconds$

So it will take 2.02 seconds to reach ground.

5 0

3 years ago

18. A swimmer steps out of a swimming pool into a light breeze. Why does

OverLord2011 [107]

When the swimmer gets out, the water on her skin begins to evaporate. This process requires takes a lot of energy and that energy comes from the heat of her body. This is similar to when someone sweats. Hope this helps!

6 0

3 years ago

1. A book resting on a shelf was found

Alex

Answer:

12J

Explanation:

Right before it hits the ground, the initial potential energy and the final kinetic energy will equal each other due to conservation of energy.

3 0

2 years ago

A man pushes a crate along a factory floor by exerting a force of 55 N. If

nika2105 [10]

Answer:

it's 220 J

the second one

7 0

2 years ago