If a rock is thrown 0.8 meters into the air, how fast was it thrown

Speed, s = 3.95 m/s

Explanation:

It is given that, a rock is thrown 0.8 meters into the air. We have to find the velocity with which it is thrown.  

Using conservation of mechanical energy as :

Initial potential energy at the ground is 0 and at maximum height the final kinetic energy is 0.

So,

putting g = 9.8 m/s² and h = 0.8 m

v = 3.95 m/s

Hence, it was thrown with a speed of 3.95 m/s

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

it's all four options.