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Question 1;
See,
- u (initial velocity of stone) = 10 m/s
- v ( final velocity of stone ) = 0 m/s
- a ( acceleration ) = 10 m/s²
We need to find the s ( distance/height attained by the stone )
Now, using 3rd equation of motion:
- v² - u² = 2as
- (0)² - (10)² = 2 × 10 × s
- - 100 = 20 × s
- - 100 / 20 = s
- -5 m = s
5 m is the height attained by the stone as distance can never be negative.
Now, we need to find t; use 1st or 2nd equation of motion, am using 1st equation of motion:
- v = u + at
- 0 = 10 + 10t
- -10 / 10 = t
- - 1 sec = t
Therefore, the time taken will be 1 second.
Do the rest by youself, they aren't that hard, just memorize the formulas and practice using them through these questions, it will help you.
Thanks!
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