Abullet moving at a speed of 152 m/s passes through a plank of wood at 128m/s. another bullet moving at 97m/s passes through the same plank at what speed?

The speed of the plank is 81.68 m/s

Explanation:

Given that,

Speed of bullet = 152 m/s

Speed of wood = 128 m/s

Speed of another bullet = 97 m/s

We need to calculate the speed of plank

Using conservation of momentum

Where,

u = initial velocity

v = final velocity

....(I)

....(II)

From equation(I) and equation(II)

Hence, The speed of the plank is 81.68 m/s

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because growing process had stoped after 4-5 year