Question

PHYSICS

1)A BULLET HITS A WALL WITH VELOCITY OF 20m/s AND PENETRATES IT UPTO A DISTANCE OF 5cm .FIND DEACCELERATION OF BULLET IN WALL

Answer 1

Initial velocity, u = 20 m/s

Distance travelled, s = 5cm=0.05 m

Let the retardation produced be ‘a’.

The final velocity is v = 0.

So,

v² = u²+2as

=> 0 = 20² +2a(0.05)

=> a = -4000 m/s²

Thus the retardation/deceleration produced is 4000 m/s²