If a car is moving on a road at 70 km/hr going due north, and then changes direction and starts traveling north-east staying at
70 km/hr, what happens to its speed and velocity?
answers are in the link guys
answers are in the link guys
2 answers:
Answer:
Velocity of the car changes while the speed will remain the same
Explanation:
As we know that the speed is the magnitude of rate of change in the position of the object
So here we have
while for finding velocity we know that it is rate of change in the position along with the direction of the motion
So it is given as
so here we can say that magnitude of the velocity in both is same while the direction is different
so correct answer will be
Velocity of the car changes while the speed will remain the same
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Given data:
* The mass of the book is 2 kg.
* The initial height of the book is 0.78 m.
* The final height of the book is 2.1 m.
Solution:
(A). The work done by the gravity on the book is,
where m is the mass, g is the acceleration due to gravity, h_i is the initial height and h_f is the final height,
The work is done in moving the object in upward direction where as the gravitational force is acting in the down ward direction. Thus, the value g (acceleration due to gravity) is taken as negative in this case.
Substituting the known values,
Thus, the work done by the gravitational force is -25.9 J.
(B). The work done by the hand on the moving the book is,
Thus, the work done by the hand on the book is 25.9 J.