Physics 105

Chapter 3 (kinematics in two dimensions)

An object moving along the x-axis has an initial velocity v= 1 m/s at t=0. It’s velocity two seconds later is -7 m/s. What is the average acceleration (in m/s2) of the particle between t=0s and t=2s?:

Which of the following statements is WRONG

&nbsp;While mass is a scalar quantity, weight is a vector quantity.

&nbsp;The action force and the reaction force can never act on the same object.

An object can move at constant velocity if only one force acts on it.

If an object is moving at constant velocity, then the resultant force acting on it is zero.

The acceleration is always along the direction of the resultant force.

An abject moving along the x- axis has an enetial velocity v=1m/s at t=0
Its velocity two secong later is -3 m/s , what is average acceleration of the particle between t=0 and t=2

two objects with masses Ma=M ,Mb=2M are released from rest at the same height h above the ground. Ignoring air resistance , which of following is correct?

both have the same speed gust before hitting the ground

A car moves along the x direction such that position as function of time is give by x=t^2 + t-2 where x in meters and t in seconds m m the average velocity ( in m/s) of the car during time interval t=1 to t=3 is

A man is walking from origin a distance of 20 m along the positive x -axis
He then turns around and moves 12m along the negative x axis , if the time of the whole trip is 6 s, what is the average speed in m/s :

The position of an object ( in m) is given as a function of time ( in s) as X(t) = 3.0 t +2.0 t^2
What is the average velocity of the object ( in m/s) between t=0 and t=3&nbsp;

A stone is thrown vertically upward reaches the highest point and returns to ground. when the stone is at top of its path, its acceleration

change direction from upward to downward&nbsp;

A car starts from origin and drives 2.2 km south , then 3.1 km in a direction 53 degree north of east. What is the car final position relative to origin :

&nbsp;3.1 km east and 1.2 km south

The figure shows the variations of the position x of a car with time t . the average velovity in m/s in the time interval
t=0 to t=6 is<img src="https://gateway.medhemmeh.com/downloads/672f10bb8064fe1639d6724e/93fp3ievm9"/>

a football player moves 15.0 m north and then 11.0 m south. The distance he has traveled and the magnitude of his displacement respectively are( in m):

&nbsp;a 10-kg rock and 20-kg rock are released from same height. If it takes the 20-kg rock a time T to reach the ground, what time it will take for the 10- kg rock to reach the ground ( ignore air resistance)

Two vectors A and B are given in terms of their components . For vector A , Ax=+5.0mandAy=-7.0m.ForvectorB,BX=+9.0mandBy=-2.0m.Find the magnitude of the vector A – B and the angle this vector makes counterclockwise relative to the + x – axis

constant velocity and there is change in acceleration

A property that causes the body to resist change in direction

A stone I projected vertically upward with speed of 15 m/s from top of a building of height h ,after 2 second the stone is :

what is average velocity of trip of 290 km in 3.25h ( in m/s)

car is moving with constant acceleration of 1.9 m/s^2 . how long ( in s)does it take to accelarerate from 60 km/h to 120 km/h

A cyclist travels 400 m northeast from a reference point . the cyclist then travels 200m north. What are the magnitude ( in m) and direction
( measurement of the angle A ,north of east) of the cyclist total displacement:

A car moves along the x axis . the variations of its displacement with time is shown in the figure. the distance ( in m) that traveled between t=0 and t=8 s is:
<img src="https://gateway.medhemmeh.com/downloads/672f10bb8064fe1639d6724e/ixh1nxp9ot"/>