Answer:
A, C, D
Explanation:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
and according to Newton's 4th law: An object that is at rest will stay at rest unless a force acts upon it. An object that is in motion will not change its velocity unless a force acts upon it.
I'd say honestly 10. An apple ways around 2 pounds.
I<span>n the absence of air resistance, all objects fall with the same acceleration due to gravity.
The acceleration of gravity does not depend on mass of the object
Hope this helps!</span>
Answer:
Kinetic energy of mass A = 20 J
Kinetic energy of mass B = 40 J
Explanation:
Lets take final speed of mass A = v
The final speed of mass B = v'
mass of A= m
mass of B = m'
m = 2 m'
There is no any external force so the linear momentum will be conserve.
Pi = pf
0 = m v + m ' v'
0 = 2 m ' v +m ' v'
v ' = - 2 v
Now from energy conservation
1/2 k x²=1/2 m v² + 1/2 m' v'²
60 = 1/2 m v² + 1/2 m' v'²
m v² + m' v'² = 120
2 m ' (-v'/2)² + m' v'² = 120
m ' v'²/2 + m' v'² = 120
m' v '² = 80
m =2 m' and v ' = - 2 v
So
m/2 ( 4 v²) = 80
m v ²=40
So the kinetic energy of mass A= 1/2 m v² = 20 J
Kinetic energy of mass B = 1/2 m' v'² = 40 J
D.) A molecule of glucose,
Kinetic energy denotes movement, no movement no kinetic energy.