Answer:
O 47 kg. m/s if they were initially headed opposite direction
O 145 kg. m/s if they were initially headed the same direction
The other two are possibilities as well if velocities are initially at an angle
Explanation:
Figure B. The second option.
Answer:
See explanation
Explanation:
Since the original count rate is 600 Bq,
i) after 1 half life, the count rate decreases to 1/2 of 600 Bq = 300 Bq
ii) after 2 half lives, the count rate decreases to 1/4 of 600 = 150 Bq
iii) after 3 half lives, the count rate decreases to 1/6 of 600 = 100 Bq
iv) after 4 half lives, the count rate decreases to 1/8 of 600 = 75 Bq
His average speed is 10.3 m/s
Explanation:
In this problem, Bolt is moving by uniform motion (=constant velocity and constant speed), so its average speed is given by
where
d is the distance covered
t is the time taken
In this race, Bolt has covered a distance of
d = 100 m
In a time of
t = 9.69 s
Therefore, his average speed is
Learn more about speed:
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