A1000 kg train car traveling at 12 m/s on a level track has 400 kg of sand dumped, vertically, into it. what is the final speed of the train car after the sand is dumped into it? ignore friction

The final speed of the train car is 8.57 m/s.

Explanation:

Given that,

Mass of train car = 1000 kg

Mass of sand = 400 kg

Speed of train car = 12 m/s

We need to calculate the final speed of the train car after the sand is dumped

Using conservation of momentum

...(I)

Put the value in the equation (I)

Hence, The final speed of the train car is 8.57 m/s.

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5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000