A police van moving on a highway with a speed of 30 m/s fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 m/s. If the muzzle speed of bullet is 250 m/s, with what speed does the bullet hit thief’s car?
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Answer:
Velocity of police v
p
=30km/h=
3
25
m/s
Velocity of thief v
t
=190km/h=
3
160
m/s
Velocity of bullet which police is fire v
b
=150m/s
final velocity of bullet muzzle from gun =v
b
+v
p
=150+
3
25
=
3
475
m/s
Let velocity of thief is Zero and seen with respect to thief. velocity of bullet w.r.t thief
v
b/t
=v
b
−v
t
=
3
475
−
3
160
=
3
315
=105m/s
Explanation:
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