The answer is B, 14 Seconds
Answer and Explanation:
The ball is bouncing to a height of 1/3 of its previous height this is a type of geometric sequence the total distance can be found by the sum of geometric sequence
For example let the initial height is 243 fit
After one bounce it will reach 243/3 =81 feet
After second bounce 81/3=27 feet
After third bounce 27/3 =9 feet
After fourth bounce 9/3 =3 feet
So a sequence is formed that is 243,81,27,9,3..........
Here
Sum of infinite GP =
From this formula we can find the total distance traveled by the ball
Answer:
Explanation:
Let consider a car travelling at a speed . The ratio of final kinetic energy to initial kinetic energy:
The final speed is:
Answer:
Therefore the velocity of the proton is m/s towards east.
Explanation:
The mass of proton is m= kg.
q= C is the magnitude of the charge of a proton.
The earth's magnetic field is B= T toward north.
Let v be the velocity of the proton towards east.
The angle between the velocity of proton towards east and magnetic field towards north is .
We know that,
Now putting the all values
m/s
Therefore the velocity of the proton is m/s towards east.