Question

1) A bullet is fired into a wall with a velocity of 50m/s If the bullet stops at a depth of 10cm inside the wall Find the retardation provided by the wall rn2) A ball is thrown vertically upward After some time it returns back to the earth Draw a speed-time graph for the ball (neglect the air resistence)

Answer 1

1) Using Newton's law of motion,

$v^{2} - u^{2} =2as$
where v is the final velocity, u is the initial velocity a is the acceleration and s is the distance traveled.

=> 0 - 50 * 50 = 2 * a * 0.1
=> a = 12500 m/s^2

2)