Answer with Explanation:
We are given that


We have to find the direction and magnitude of the third force acting on the object.
Resultant force,F=

The object moves with constant velocity .Therefore, net force on object is equal to zero
So,Third force,
Direction,

Angle lies in second quadrant because the direction of third force is opposite to the direction of the resultant force of F1 and F2.
Therefore,
Answer:

24.21 m/s
Explanation:
x = Displacement in x direction = 55 m
y = Displacement in x direction = 0
= Height of the ball when the ball is kicked = 1 m
t = Time taken = 4.2 s
= Acceleration due to gravity = 
u = Initial velocity of ball
Displacement in x direction is given by

Displacement in y direction is given by


The ball should be kicked at an angle of 

The initial speed of the ball is 24.21 m/s.
Answer:
Waxing Gibbous
Third quarter
Waning Gibbous
Explanation:
If moon rises at 3:00 pm then the phase of the moon will be "Waxing Gibbous".
This is because, the moon is actually not fully illuminated but has achieved more than half of its full illumination.
If the moon is highest in the sky at sunrise then the phase of the Moon will be the "Third quarter"
This is because of the fact that at this position moon will rise at midnight, thus it will be at the highest point at the time of the sunrise.
If the moon sets at 10:00 am then the phase of the Moon is "Waning Gibbous"
This is because of the fact that at this position the Moon is moving towards becoming new Moon but at the same time, the moon is illuminated more than its half illumination.
Answer:
Change in mechanical energy, 
Explanation:
It is given that,
Mass of the projectile, m = 12 kg
Speed of the projectile, v = 20 m/s
Maximum height, h = 18 m
Initially, the projectile have only kinetic energy. it is given by :


K = 2400 J
Finally, it have only potential energy. it is given by :
P = mgh

P =2116.8 J
The change in mechanical energy is given by :



So, the change in mechanical energy is 283.2 J. Hence, this is the required solution.