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A police jeep is chasing with, velocity of $45 \mathrm{~km} / \mathrm{h}$ a thief in another jeep moving with velocity $153 \mathrm{~km} / \mathrm{h}$. Police fires a bullet with muzzle velocity of $180 \mathrm{~m} / \mathrm{s}$. The velocity it will strike the car of the thief is
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150 m/s
Effective speed of the bullet
$=$ speed of bullet + speed of police jeep
$=180 \mathrm{~m} / \mathrm{s}+45 \mathrm{~km} / \mathrm{h}=(180+12.5) \mathrm{m} / \mathrm{s}=192.5 \mathrm{~m} / \mathrm{s}$
Speed of thief's jeep $=153 \mathrm{~km} / \mathrm{h}=42.5 \mathrm{~m} / \mathrm{s}$
Velocity of bullet w.r.t thief 's car $=192.5-42.5=150 \mathrm{~m} / \mathrm{s}$
$=$ speed of bullet + speed of police jeep
$=180 \mathrm{~m} / \mathrm{s}+45 \mathrm{~km} / \mathrm{h}=(180+12.5) \mathrm{m} / \mathrm{s}=192.5 \mathrm{~m} / \mathrm{s}$
Speed of thief's jeep $=153 \mathrm{~km} / \mathrm{h}=42.5 \mathrm{~m} / \mathrm{s}$
Velocity of bullet w.r.t thief 's car $=192.5-42.5=150 \mathrm{~m} / \mathrm{s}$
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