Answer:
<em>45.375m</em>
Explanation:
To get the distance travelled by the body we will use the equation of motion
S = ut + 1/2at²
u is the initial speed = 0m/s
a is the acceleration
t is the time = 5 seconds
We need to get the acceleration first:
According to Newton's second law,
Fm is the moving force = Wsin theta
Ff is the frictional force = 1500N
m is the mass = W/g
m = 4000/9.8
m = 408.16kg
Substitute the given values in the formula and get the acceleration:
Get the required distance:
Recall that S = ut+1/2at²
S = 0(5) + 1/2*3.63*5²
S = 0+0.5*3.63*25
S = 45.375m
<em>Hence the distance travelled by the body in 5 seconds if the force of friction is 1500N is 45.375m</em>
I would go with stronger or 'a larger force' than sliding friction. either way, the reasoning is that friction is caused by the force earth is exerting on an object. when this object is in motion, there are multiple vectors that this force can be broken down into, and also momentum and inertia come in to play.
A. Two objects coming in contact with each other
Answer B is the correct answer
We know that kinetic energy , where m is the mass of object and v is the velocity of object.
In this case only velocity is the variable, mass remains constant.
So point having higher velocity has higher kinetic energy.
When it leaves the racket, the ball will be having a certain height, but just before it reaches the ground it will not having any height. So maximum velocity of ball is at that time when it reaches just above the ground.
So option B is the correct answer.
The instrument that measures wind is called anemometer. Anemometer not only measures wind, but also, this measures the direction of the wind. And anemometer is also a common device used in a station weather. It is dervived from the greek work anemos which means wind.