Answer:
B. twice as much kinetic energy
Explanation:
Lets take the mass of the first marble =2 m
the mass of the second marble = m
We know that velocity of particle does not depends on their mass that is the velocity of both mass will be same after dropping from the roof.
We know that kinetic energy of a mass is given as
Kinetic energy for heavier mass
Kinetic energy for light mass
KE=2 KE '
Form above two equation we can say that ,the kinetic energy for the heavier mass is twice the lighter mass.
Therefore the answer will be B.
Answer:
Logically yes, because Newton's Third law state "When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body."
If force wasn't pushing up then neither gravity is pulling down.
Answer:
The centripetal acceleration of the ball is 571.4m/s²
Explanation:
What is centripetal acceleration? Centripetal acceleration is the property of the motion of a body around a circular path. The acceleration is directed radially toward the centre of the circle and has a magnitude equal to the square of the body's speed along the curve divided by the distance from the centre of the circle to the moving body.
ac = v²/r
ac = centripetal acceleration
v = velocity
r = radius
Given data
v= 20m/s
r=0.7m
Substituting our data into the expression for centripetal acceleration we have
ac= 20²/0.7
ac=400/0.1
ac= 571.4.m/s²
Conduction. is a transfer of energy by direct contact
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