Answer:
When a heavy football player and a light one run into each other, does the lighter player really exert as much force on the heavy player s the heavy player exerts on the light one. Yes. The interaction between the two players, the force each exerts on the other have equal strength.
Answer:
mass
Explanation:
As this is directly related to inertia. Inertia is the property of unit which resists the change of state of rest or motion
I think it's C. if we're talking about a rover.
But if it's a rocket that's computerized and automatic (synonym of unmanned)... Then it's B.
Answer:

Explanation:
Given that
At starting separated = 1.20m
And the increase in background noise by Δβ = 5 dB, due to which the level of sound also rises
Based on the above information, the separation rf that is needed is shown below:
As we know that

Hence, the separation r_f i.e. required is 
We simply applied the above equation so that the correct separation could come
So, the speed of the ball after 2 seconds after free fall is <u>20 m/s</u>.
<h3>Introduction</h3>
Hi ! I'm Deva from Brainly Indonesia. In this material, we can call this event "Free Fall Motion". There are two conditions for free fall motion, namely falling (from top to bottom) and free (without initial velocity). Because the question only asks for the final velocity of the ball, in fact, we may use the formula for the relationship between acceleration and change in velocity and time. In general, this relationship can be expressed in the following equation :

With the following conditions :
- a = acceleration (m/s²)
= speed after some time (m/s)
= initial speed (m/s)- t = interval of time (s)
<h3>Problem Solving</h3>
We know that :
- a = acceleration = 9,8 m/s² >> because the acceleration of a falling object is following the acceleration of gravity (g).
= initial speed = 0 m/s >> the keyword is free fall- t = interval of time = 2 s
What was asked :
= speed after some time = ... m/s
Step by step :




So, the speed of the ball after 2 seconds after free fall is 20 m/s.