Physics Spring 2015 Test A build nu measures 30 feet by 400 feet. What the area

Question

Physics Spring 2015 Test A build nu measures 30 feet by 400 feet. What the area of the in sware b, Iosom2 2. A bug crawls 2.25 m along the base of a Upon reaching corner, the of travel from south The bug then crawls 3.15 m before what is the magnitude of the bug's displacement? 5. A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60.0 m/s n the direction opposite that of the cars velocity. What was the speed, in km/h, of the car before the collision? A) 29.2 km/h B) 44.8 km/h C) 97.2 km/h D) 105 km/h E) 144 km/h

Explanation / Answer

Let the initial velocity of Car is U and final velocity V , acceleartion (a)= - 60 m/s2 (negative because of opposite direction) and t is the time = 0.45 s
So applying first equation of motion.

V = U +at , as it is coming finally to rest so V= 0
therefore U = 27 m/s
on converting it into km/h

U = 97.2 Km/h

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