Posted by John on Wednesday, August 1, 2012 at 1:38am.
A police car traveling at 94.5 km/h is traveling west, chasing a motorist traveling at 77.2 km/h.
(a) What is the velocity of the motorist relative to the police car?
The magnitude and its direction
(b) What is the velocity of the police car relative to the motorist?
The magnitude and its direction
(c) If they are originally 250 m apart, in what time interval will the police car overtake the motorist?
A full working would be appreciated! thanks!

Physics  Henry, Wednesday, August 1, 2012 at 6:41pm
a. Vm = 77.2  94.5 = 17.3 km/h.
b. Vp=94.5  77.2=17.3 km/h=Velocity of policeman.
c. Vm*t=X km=Dist traveled bymotorist.
Eq1: 77.2t = X.
Vp*t = (X+250)=Dist. traveled by police.
Eq2: 94.5t = X+0.250)km.
In Eq2, substitute 77.2t for x:
94.5t = 77.2t + 0.2525
94.5t  77.2t = 0.25
17.3t = 0.25
t = 0.01453 h. = 0.87 min = 52.3 s.
Answer This Question
Related Questions
 Physics  A motorist traveling at 30 m/s passes a parked police car. At the ...
 PHYSICSURGENT HELP  A stationary police car emits a sound of frequency 1200 Hz...
 Math  A motorist traveling 55 mph is being pursued by a highway patrol car ...
 Physics  A speeding motorists passes a stopped police car. At the moment he ...
 physics  A motorist travelling at 82 km/hr is being chased by a police car at ...
 Physics  A motorist travelling at 107 km/hr is being chased by a police car at ...
 Physics  Car A is traveling at 84 km/h while Car B is traveling at 58 km/h. ...
 Physics  Car A is traveling at 84 km/h while Car B is traveling at 58 km/h. ...
 physics  a drunken motorist who is moving at a constant velocity of 90 km/h ...
 Physics  An unmarked police car traveling a constant 90 km/h is passed by a ...
More Related Questions