A 500-g lump of clay is dropped onto a 1-kg cart moving at 60 cm/s. The clay is moving downward at 30 cm/s just before l dith t Aft th lli i thd f th tlanding on the cart. After the collision, the speed ofthe cartand clay is closest to:

The speed of the cart and clay after the collision is 50 cm/s .

Explanation:

Given :

Mass of lump , m = 500 g = 0.5 kg .

Velocity of lump , v = 30 cm/s .

Mass of cart , M = 1 kg .

Velocity of cart , V = 60 cm/s .

We know by conservation of momentum :

Here , is the speed of the cart and clay after the collision .

Putting all value in above equation .

We get :

Hence , this is the required solution .

the device is called “ rocket engine”

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