The speed of the car is 60 m/s
Explanation:
The speed of an object is a scalar quantity telling "how fast" the object is moving, regardless of its direction. It can be calculated as follows:

where
d is the distance covered
t is the time taken
For the car in this problem, we have
is the distance covered
is the time taken
Subsituting into the equation, we find the speed:

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Answer:He lifts 2 meters
Explanation:We are trying to find the distance. The formula for distance is W/Force. 50 is our amount of work. 25N is how much force was used. Divide the work bye the force. 50/25=2M
Answer:
The recoil speed of the man and rifle is
.
Explanation:
The expression for the force in terms of mg is as follows;
F=mg
Here, m is the mass and acceleration due to gravity.
Rearrange the expression for mass.

Calculate the combined mass of the man and rifle.

Put
.


The expression for the conservation of momentum is as follows as;

Here,
is the mass of the man and rifle,
is the mass of the rifle,
are the initial velocities of the man and bullet and
are the final velocities of the man and rifle and rifle.
It is given in the problem that a rifle with a weight of 25 N fires a 4.5-g bullet with a speed of 240 m/s.
Convert mass of rifle from gram to kilogram.


Put
,
,
,
and
.




Therefore, the recoil speed of the man and rifle is
.
They can do the experiment more than once and make sure they follow steps right like in a experiment
Many fundamental laws of physics and chemistry can be formulated when doing this.