MCQ
A ball is thrown upwards with a velocity of $25\ m/s.$ What is the time taken by the ball to return to the thrower $(g = 10\ m/s^2)$
- ✓$5\sec$
- B$2.5\sec$
- C$3\sec$
- D$4.2\sec$
✓
Answer
Correct option: A.
$5\sec$
Initial velocity of the ball final velocity $= 0\ m/ s$
acceleration due to gravity $(g) = −10\ m/ s^2 ($upward motion$)$
By using the formula,
$v = u + at$
$O = 25 + (−10) \times t$
$10t = 25$
$t = 2.5\sec.$
The time taken for upward journey is equal to the time taken for downward journey.
Therefore, total time taken by the ball $= 2.5 + 2.5 = 5\sec$.
acceleration due to gravity $(g) = −10\ m/ s^2 ($upward motion$)$
By using the formula,
$v = u + at$
$O = 25 + (−10) \times t$
$10t = 25$
$t = 2.5\sec.$
The time taken for upward journey is equal to the time taken for downward journey.
Therefore, total time taken by the ball $= 2.5 + 2.5 = 5\sec$.
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