Abullet traveling horizontally at a speed of 350 m/s hits a board perpendicular to the surface, passes through it, and emerges on the other side at a speed of 210 m/s. if the board is 4.00 cm thick, how long does the bullet take to pass through it? (assume a constant deceleration as the bullet passes through the board.

The average speed of the bullet as it travels through board,

As the speed of the bullet decreases linearly in the board, therefore the time of the bullet travels through the board is

As the board is 4.0 cm ( 0.04 m) thick, therefore

Thus, the time taken by the bullet to pass the board is .

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.