# 2 Problems i need hlep with, Acceleation and Time

1. ok so i have my physics packet and i need help bad. the problem is...
How long does it take a car to cross a 45m wide intersction after the light turns green if it accelerates from rest to constant 14.3 m/sec^2
Find T

and

A Car accelerates along a straight road from rest to 495 km/h in 16 sec. what is the magnitude of its average acceleration
Find a= ? km per hour/ sec
Find a= ? m/s^2

2.i don't have much equations for this problem in any of my notes

1. ok so i have my physics packet and i need help bad. the problem is...
How long does it take a car to cross a 45m wide intersction after the light turns green if it accelerates from rest to constant 14.3 m/sec^2
Find T

and

A Car accelerates along a straight road from rest to 495 km/h in 16 sec. what is the magnitude of its average acceleration
Find a= ? km per hour/ sec
Find a= ? m/s^2

2.i don't have much equations for this problem in any of my notes

Do you the two velocity and position kinematic equations?

Xf=Xi+Vi*t+(a*t2)/2

Vf=Vi+a*t

Xf=final position
Xi=initial position
Vf=final velocity
Vi=initial velocity
t=time
a=acceleration

i do have the 2nd one but i dont see how they can help me

Try and use the first equation for your first problem.
You dont need more then that

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