Work is said to be positive when Kinetic energy is greater than velocity (option B). Details about work can be found below.
<h3>What is work?</h3>
Work is a measure of energy expended in moving an object; most commonly, force times distance. This means that no work is done if the object does not move.
However, work can either positive or negative depending on the direction of the object and the force applied.
When force and displacement are in the same direction, the work performed on an object is said to be positive work.
This further means that the kinetic energy, which is the energy due to motion, will be greater than the velocity of the object in order to overcome the object.
Therefore, work is said to be positive when kinetic energy is greater than velocity.
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Answer:
2.06 m/s
Explanation:
From the law of conservation of linear momentum, the sum of momentum before and after collision are equal. Considering this case where we have frictionless surface, no momentum is lost in the process.
Momentum before collision
Momentum is given by p=mv where m and v represent mass. The initial sum of momentum will be 9v+(27*0.5)=9v+13.5
Momentum after collision
The momentum after collision will be given by (9+27)*0.9=32.4
Relating the two then 9v+13.5=32.4
9v=18.5
V=2.055555555555555555555555555555555555555 m/s
Rounded off, v is approximately 2.06 m/s
Answer:
Frictional force will be equal to 257 N
Explanation:
We have given mass m = 142 kg
Static frictional coefficient and kinetic coefficient friction
Force applied F = 357 N
Static friction force is given by
As static friction is greater than the force applied
So body will not move
And friction force will be equal to 257 N
The small guy experiences the larger average force
Answer:
The speed is 15 km/h or 4.16 m/s.
Explanation:
A boat travels the distance that separates Gran Canaria from Tenerife (90 km) in 6 hours. Which the speed of the boat in km / h? And in m / s?
Given that,
Distance, d = 90 km = 90000 m
Time, t = 6 hours = 21600 s
Speed = distance/time
or
So, the required speed is 15 km/h or 4.16 m/s.