عندي كم سؤال في الفيزياء احتاج المساعدة

[عصير اسمنت]

عندي كم سؤال مدوختني يا ليت تجاوبو عليها بس الي يكون متأكد

q1: at t=0 a car moves with velocity v0= 2i +J (m/s ) and

a=2J (m/s2) the velocity of car at t=2 is

q2: a partical moves in xy plan x(t)=2t(m) and y(t)=t2-1
the vilocity of the partical at t=1 is

q3:the frictional force on a moving body is proportional to the:

a)force causing the motion
b)weight of the body
c)acceleraion
d)normal force
e)none of these

q4:the vlocity and acceleraion of a body in uniform circular
motion are:

a)differed by 45
b)perpendicular
c)differed by 35
d)parallel
e) none of these

وشكرا