Answer:
-25 m/s
Explanation:
Since the ball was caught at the same height, it has the same speed and opposite direction that it went up with.
So you know the speed of a wave, and speed is how much the wave moves per second. This wave travels 3x10^8 meters per second. So to find how for you traveled you need to know how many seconds the wave traveled for, 20 minutes is equal to 1200 seconds (times 20 minutes by 60). Then times the seconds by the speed (3x10^8 m/s)x(1200 s) = 3.6x10^11 meters
Answer:
v = 87.5 km/h
Explanation:
To find the speed of the car you use the following formula:
(1)
x: distance traveled by the car = 350km
t: time = 4h
you replace the values of x and t in the equation (1):
hence, the speed of the car is 87.5km/h
Answer:
option 4
Explanation:
Light's velocity in air ( 3 × 10^8 m/s ) is much greater than sound's velocity in air ( 343 m/s )
Hence due to difference in velocities , during lightning light is seen first & sound is heard later