Amotorboat traveling 4 m/s, east encounters a current traveling 3.0 m/s, north. a) what is the resultant velocity of the motorboat? b) if the width of the river is 80 meters wide, then how much time does it take the boat to travel shore to shore? c) what distance downstream does the boat reach the opposite shore?

Explanation:

It is given that,

Velocity in East,

Velocity in North,

(a) The resultant velocity is given by :

(b) The width of the river is, d = 80 m

Let t is the time taken by the boat to travel shore to shore. So,

t = 16 seconds

(c) Let x is the distance covered by the boat to reach the opposite shore. So,

x = 48 meters

Hence, this is the required solution.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.