<h2>
Option 3, 216 m is the correct answer.</h2>
Explanation:
We have initial velocity, u = 15 m/s
Time, t = 12 seconds
Final velocity, v = 21 m/s
We have equation of motion v = u + at
Substituting
21 = 15 + a x 12
a = 0.5 m/s²
Now we have equation of motion v² = u² + 2as
21² = 15² + 2 x 0.5 x s
s = 216 m
Displacement = 216 m
Option 3, 216 m is the correct answer.
Answer:
The potential energy in the water will be 0.0769 mJ
Explanation:
We know that energy stored in the capacitor due to charge is given by
From the relation we can see that potential energy is inversely proportional to the capacitance
And we also know that capacitance is directly proportional to the dielectric constant
So the new potential energy will be
So the potential energy in the water will be 0.0769 mJ
Answer:
is that a question or a statement lol
Explanation:
By law of conservation of momentum:
Summation of momentum before collision = Summation of momentum after collision
Momentum = mass*velocity
If v and u represents initial and final velocities and assuming that the bred marble was at rest before collision;
m1u1+m2u2 = m1v1+m2v2
But u2 = 0
Then,
m1u1 = m1v1+m2v2
u1 = (m1v1+m2v2)/m1
Where;
u1 = Initial velocity of red marble before collision
m1 = mass of blue marble = 0.1 kg
v1 = Final velocity of red marble = 10 m/s
v2 = Final velocity of blue marble = 15 m/s
m2 = mass of blue marble = 70 g = 0.07 kg
Substituting;
u1 = (0.1*10+0.07*15)/0.1 = 20.5 m/s
Therefore, red marble original velocity before collision was 20.5 m/s.