Answer:
Explanation:
The velocity of an object relative to a system
, the velocity of that system 
and the velocity measured by an observer at rest 
are related by the following equation:
In this case, the object is the boat, the system is the water and we are finding the velocity measured by an observer at rest. So, the formula becomes:
In words, the velocity of the boat relative to an observer standing on either bank, is 18.0km/h.
Explanation: As the angle is increased the acceleration of the object is increased as the angle increases the component of the force parallel to the incline increases and the component of forced perpendicular to the inclined decreases it is the parallel component of the weight vector that causes the acceleration.
Body works like a computer whenever there is any problem it warns you and those warnings are termed as symptoms. Of the body doesn't show symptoms we won't be able to detect the problem in our body.
We can first obtain time of flight from vertical fall
Initial velocity U=0, d = 6 m, a = 9.8 m/s²
d = ut + 1/2 at²
6.0 = 0 + (1/2 × 9.80 t²)
t = √(12/9.8)
= 1.106 sec
Horizontal velocity = Vh = Dh/t
= 24.0 /1.106 s
= 21.69 m/s
The ball was thrown at a speed of 21.69 m/s
