An object is falling down with a speed of 20 m/s. After 3 secondsits velocity will be _ m/s (g = 10 m/s2).
Correct answer: B. 50
- A. 05
- B. 50
- C. 55
- D. 95
Explanation
To find the final velocity of the object after 3 seconds of free fall, we use the kinematic equation: v = u + at. The initial velocity (u) is 20 m/s, the acceleration due to gravity (a) is 10 m/s2, and the time (t) is 3 seconds. Substituting these values into the equation, we get v = 20 + 10(3) = 20 + 30 = 50 m/s. Thus, the correct answer is 50 m/s. Option A (05) incorrectly assumes deceleration, Option C (55) miscalculates the velocity increase, and Option D (95) is an extreme overestimate.
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