A bullet comes out of the barrel of gun of length 2 meter with a speed of 20 m/s. The average acceleration of the bullet is ...... `m//s^(2).`

Options

A. 10
B. 100
C. 1000
D. 1

Answer

C

Explanation

`{:(v ^(2) - v _(0) ^(2)= 2ad), ( therefore 2ad =v _(0)^(2))|{:(v =0 ms ^(-1) ("suppose") v _(0) = 20 ms ^(-1)), ( d=2 m"," a = ?):}`
`therefore a = (v _(0) ^(2))/(2d)`
`= (400\)/(4) `
`therefore a = 100 ms ^(-2)`