Physics · Physics
If a ball is dropped from a tall building with a uniform acceleration of 9.8 m/s², what will be its velocity after 3 seconds?
- 139.2 m/s
- 219.6 m/s
- 39.8 m/s
- 429.4 m/s✓
Correct answer
29.4 m/s
Explanation
स्पष्टीकरण:
दी गई जानकारी:
प्रारंभिक वेग (
𝑢
0 मी/से (चूँकि गेंद को स्थिर अवस्था से गिराया गया है)
त्वरण (
𝑔
- 9.8
- 9.8 मी/से²
समय (
𝑡
3 सेकंड
सूत्र: गति के प्रथम समीकरण के अनुसार,
𝑣
𝑢
𝑔
𝑡
v=u+gt
गणना:
𝑣
- 9.8
- 29.4
v=0+(9.8×3)=29.4 मी/से
निष्कर्ष: 3 सेकंड के बाद गेंद का वेग 29.4 मी/से होगा।
सही उत्तर:
- (A) 29.4 मी/से
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