The horizontal velocity of the second rock is 5 m/s, so if we pretend air resistance doesn't exist, it will maintain that horizontal velocity, meaning that there is no horizontal acceleration.

7 0

3 years ago

What 3 types of metals have magnetic properties

satela [25.4K]

Ferromagnetic, paramagnetic, and diamagnetic

6 0

3 years ago

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A 790N person runs up a flight of 40 stairs (.25m for each step) in 20 seconds, and then down 10 steps in 5 seconds. How much to

Romashka [77]

A person runs up 40 stairs and then come down 10 steps

So total stairs upwards is given as

$N = 40 - 10 = 30$

now here we will have total height reached

$H = N\times h$

$H = 30 \times 0.25 = 7.5 m$

Now total energy used or mechanical work done is

$W = mgH$

$W = 790 \times 7.5 = 5925 J$

Now the mechanical power is given as

$P = \frac{W}{t}$

$P = \frac{5925}{20+ 5} = 237 W$

7 0

3 years ago

The amount of potential energy possessed by an elevated object is equal to

Sedbober [7]

Answer:

Potential energy of the object will be equal to mgh

Explanation:

Let the mass of the object is m

Acceleration due to gravity is $gm/sec^2$

Let the object is released from height h

We have to find the potential energy

Potential energy is of an object released from height h is equal to

$U=mgh$ , here m is mass, g is acceleration due to gravity and h is height from which object is released.

4 0

4 years ago