Question

Answer these questions.

1) A bullet hits a wall with velocity 20m/s and penetrates upto 5cm . Find the deceleration of the bullet In
in this period , find the acceleration .

3) A ship moving with a constant acceleration
36km/h^2 in a fixed direction speeds up from 12km/h to 18km/h . Find the distance traversed by ship in this period .

4) A particle starts from a point with a velocity of 6m/s and moves with an acceleration of -2m/s^2 . Show that after 6sec the particle will be at starting point .



Answer this question quickly . This is urgent.

If you give the right answer , I will mark you brainliest .
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Answer 1

Explanation:

1. u=20m/s

v=0

S=5cm = 0.05m

a=(v²-u²)/2S= (0-400)/0.1=-4000m/s²

3. a=36km/h²

u=12km/h

v=18km/h

S=(v²-u²)/2a=(324-144)/72= 2.5 km

4. u=6 m/s

a=-2 m/s²

t=6s

v=u+at = 6+(-2)6=6-12=-6 m/s

S=(v²-u²)/2a = (36-36)/(-4) =0

Since displacement is zero, the particle is at the starting point after 6s.