1.

police van moving on a highway with a speed of30 km h fires a bullet at a thiefs car speeding awayin the same direction with a speed of 192 km h-1. Ithe muzzle speed of the bullet is 150 m s, withwhat speed does the bullet hit the thiefs car? (Note:Obtain that speed which is relevant for damagingthe thiefs car).

Answer»

Velocity of police van( Vp) = 30 km\ h= 25/3 mpsVelocity of theif ( Vt) = 192 kph = 160/3 mpsMuzzle velocity ( Vbg) = Vb - Vg = 150 mps Vg = Vp = 25/3 mpsVb = 475/3 mpsDamaging speed = velocity of bullet with respect to thief car = Vbt = Vb - Vt = 475/3 - 160 /3 ` = 105 mps

how u get the value 25/3



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