A small sandbag is dropped from rest from a hovering hot-air balloon. (assume the positive direction is upward.) (a) after 1.5 s
1 answer:
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Average speed is defined by the following formula
here
D = total distance that an object move from its initial position to final position
t = total time of the motion
so here we will say that there is no such relation between initial or final speed or we can say maximum or minimum speed of object with average speed of object.
We only need to find the total distance and total time of motion in order to find the average speed
here we can see many examples like let say an object moves with speed v1 for time t1 and then with speed v2 for time t2 then here average speed is given as
since we know that distance covered is product of speed and time
that's why we used above equation for finding total distance
now the average speed will be
so this is how we can find the average speed for above motion
so average speed is always between maximum and minimum speed any value in-between.
It is neither the maximum value nor it is minimum value
Answer:
Their speed immediately after the collision is 60 km/h
Explanation:
The magnitude that characterizes the state of motion of a body is called the quantity of motion. The momentum of a particle of mass m moving with velocity v is defined as the product of mass and velocity:
p=m*v
Newton's second law states that to accelerate an object you must apply a force to it. In other words, to change the moment of an object, an impulse must be applied to it, an impulse that is produced by a force. In both cases there is an external agent that exerts the force or the impulse, the internal forces are not considered. When the force net is zero, so the net momentum is zero, and therefore there is no change in total momentum. Then it can be stated that if a net force is not exerted on a system, the total moment of the system cannot change.
In summary, the principle of conservation of linear momentum, also known as the principle of conservation of momentum, states that if the resultant of the forces acting on a body or system is zero, its momentum remains constant in time.
Then before collision, the momentum of truck is 1,500 kg*80 km/h = 120,000 kg.km/h and the momentum of car is 1,000 kg* 30 km/h = 30,000 kg.km/h
So, the total momentum before collision is 120,000 kg*km/h+ 30,000 kg*km/h = 150,000 kg.km/h
The two cars stick together after the collision. This means that the speed V of both is the same. Therefore, the momentum after collision is
V*(1,500 kg + 1,000 kg) = V*2,500 kg
Applying the law of conservation of momentum, that it states that the total momentum of two objects before collision is equal to the total momentum of the two objects after collision., you get:
150,000 kg.km/h= V*2,500 kg
Solving:
V= 60 km/h
<u><em>Their speed immediately after the collision is 60 km/h</em></u>