Please solve this Q 21 A loaded 20,000 kg coal wagon is moving on a linear track with a - Physics - Communication Systems

Question

Please solve this
Q 21 A loaded 20,000 kg coal wagon is moving on a linear track with
a 8 m/s Suddenly 8000 kg of coal is dropped out of wagon The final
speed of the wagon is
(1) 6 m s - 1
(2) 8 m s - 1
(3) 40 3 m/s
(4) 20 3 m/s

Samiksha · Answer

M1 = 20,000; v1 = 6 m/s ; m2=20000-5000= 15000 ; for dropped coal m
= 5000 v = 6 m/s ( it is dropped with same speed) Now by
conservation of linear momentum, M1v1 = m2v2 - mv 20000(6) =
15000(v2) - 5000(6) V = 6 m/s

Please solve this Q.21. A loaded 20,000 kg coal wagon is moving on a linear track with a 8 m/s. Suddenly 8000 kg of coal is dropped out of wagon. The final speed of the wagon is (1) 6 m s - 1 (2) 8 m s - 1 (3) 40 3 m/s (4) 20 3 m/s

Please solve this
Q.21. A loaded 20,000 kg coal wagon is moving on a linear track with a 8 m/s. Suddenly 8000 kg of coal is dropped out of wagon. The final speed of the wagon is
(1) 6 m $s^{- 1}$
(2) 8 m $s^{- 1}$
(3) $\frac{40}{3}$ m/s
(4) $\frac{20}{3}$ m/s