Please help me to do this
Asked by pukai7229
10th July 2018,
11:28 PM
Answered by Expert
Answer:
This question is solved using conservation of linear momentum.
Projectile upward velocity after 5 seconds, just before explosion = u - g×t = 100 - 10×5 = 50 m/s
(for conveneience of calculation I assume g = 10 m/s2 )
momentum before explosion = 50×50 = 2500 kg m/s ..........(1)
Let the 30 kg fragment velocity is v after explosion.
Total linera momentum after explosion = 20×150 + 30×v .........(2)
By equating (1) and (2) , solving for v, we get v = -50/3 m/s
Hence the other fragment moving vertically downwards with velocity (50/3) m/s
Answered by Expert
11th July 2018,
11:55 AM
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