For Chemistry Tutorials
Introduction
 
Vectors
 
Mechanics
 
Energy Work Power
 
Impulse Momentum
 
Rotational Motion
 
Optics
 
Properties Of Matter
 
Heat Temperature And Thermal Expansion
 
Electrostatics
 
Electric Current
 
Magnetism
 
Waves
 
Exams and Problem Solutions
 
--Vectors Exam and Problem Solutions
 
--Kinematics Exams and Problem Solutions
 
--Kinematics Exam1 and Problem Solutions
 
--Kinematics Exam2 and Problem Solutions
 
--Kinematics Exam3 and Problem Solutions
 
--Kinematics Exam4 and Problem Solutions
 
--Dynamics Exams and Problem Solutions
 
--Work Power Energy Exams and Problem Solutions
 
--Impulse Momentum Exams and Problem Solutions
 
--Rotational Motion Exams and Problem Solutions
 
--Optics Exams and Problem Solutions
 
--Properties of Matter Exams and Problem Solutions
 
--Heat Temperature and Thermal Expansion Exams and Problem Solutions
 
--Electrostatics Exams and Problem Solutions
 
--Electric Current Exams and Problem Solutions
 
--Magnetism Exams and Problem Solutions
 
--Waves Exams and Problem Solutions
 
Old Version
 


Menu

Kinematics Exam2 and Problem Solutions


Kinematics Exam2 and  Problem Solutions

1. An object is dropped from 320 m high. Find the time of motion and velocity when it hits the ground.(g=10m/s2)

 h=1/2.g.t2  , v=g.t  

h=320m

g=10m/s2

320=1/2.10.t2

t=8s.

v=g.t=10.8=80m/s

2. An object does free fall and it takes 60m distance during last 2 seconds of its motion. Find the height it is dropped.(g=10m/s2)

t is the time of motion

h=1/2.g.t2

h1=1/2.g.t12

put t1=t-2 and h-h1=60 in the equation,

1/2.g.t2-1/2.g.t12=60

5t2-5(t2-4t+4)=60

t=4s

h=1/2.g.t2=1/2.10.42=80m

3. An object is dropped from 144m height and it does free fall motion. Distance it travels and time of motion are given in the picture below. Find the distance between points B-C.

We can draw velocity time graph of object and area under this graph gives us position of the object.

As you can see from the velocity time graph, object travels 5h distance during 2t-3t which is the distance between the points B and C.

All distance traveled is 36h

144m=36h

h=4m

Distance between B-C=5h=5.4m=20m

4. A hot- air balloon having initial velocity v0 rises. Stone dropped from this balloon, when it is 135 m height, hits the ground after 9 s. Find the velocity of the balloon.

 

-h=v0.tfligth-1/2.g.tfligth2

-135=v0.9-1/2.10.(9)2

-135=9vo-405

9v0=270

v0=30m/s

 

5. Look at the given picture below. Object K does free fall motion and object B thrown upward at the same time. They collide after 2s. Find the initial velocity of object B. (g=10m/s2)

Object A does free fall motion

hA=1/2.10.22=20m

hL=v0.t-1/2.g.t2

hL=v0.2-1/2.10.22

hL=2v0-20

 hK+hL=80m

20m+hL=80m

2v0-20=60m

v0=40m/s


Author:


Tags:


© Copyright www.PhysicsTutorials.org, Reproduction in electronic and written form is expressly forbidden without written permission of www.PhysicsTutorials.org. Privacy Policy