فيزياء: أي استفسار أول سؤال

[CDTOE]

أستاذ , علي .. لدي 4 مسائل جديدة تخص الحركة في خط أفقي , حتى الآن لم اقم بحل ايا منها لانشغالي بدراسة مواد أخرى , فاتمنى منك حلها :

1 - Spotting a police car , you brake a Porsche from 75 km/h to 45 km/h over a displacement of 88 m .

a - what's the acceleration , assumed to be constant ?

b - what's the elapsed time ?

c - if you continue to slow down with the acceleration calculated in ( a ) , how much time will elapse in bringing the car to rest from 75 km/h ?

d - In ( C ) , what's distance will be covered ?

×××

2 - An automobile travels with constant acceleration is brought to stop from a speed of 20 m / s in a distance of 40 m .

a - What's acceleration ?

b - what's the time it takes to stop the car ?

××××

3 - A race car is moving at a constant speed of 35 m / s , passes stationary police car . The police car starts moving with a constant acceleration of 4 m/s^2 . Find the distance at which the police car overtakes the race car ?

×××

4 - A motorcyclist heading east through a small town accelerates as he passes the signpost at X=0 m marking the city limits . His acceleration is constant a = 4 m/sec^2 . At time t = 0 he's at X=5 m and his velocity V=3 m/sec

a - find his position and velocity at time t=2 sec

b - Where's he when his velocity is 5 m/sec ?

×××××××

شكرا مقدما , وراح اخبرك بمطابقة حلي لحلك لاحقا عندما اتفرغ لها .