The amount of energy in the universe is remaining constant .
So , option (D) is right ..
M = mass of the ball A = 5.0 kg
m = mass of the ball B = ?
V = initial velocity of the ball A before collision = 20 m/s
v = initial velocity of the ball B before collision = 10 m/s
V' = final velocity of the ball A after collision = 10 m/s
v' = final velocity of the ball B after collision = 15 m/s
using conservation of momentum
M V + m v = M V' + m v'
(5.0) (20) + m (10) = (5.0) (10) + m (15)
100 + 10 m= 50 + 15 m
5 m = 50
m= 10 m/s
I go with D .
Explanation:
I go with D because neither if the ballons have the same thermal energy.
The accurate description of vibrations is that, neither ultrasonic nor infrasonic vibrations can be heard by humans. The Infrasonic vibration frequency is lower than 20Hz, whereas ultrasonic vibration frequency is greater than 20,000Hz. The normal range of frequency of hearing for humans is only 20Hz-20,000Hz.
