1800-150-456-789
FlagBACK
Flag Mechanics> A ball dropped on to floor from a height ...
question mark

A ball dropped on to floor from a height of 10m rebounds to a height of 2.5m. If the ball is in contact with the floor for 0.02s, its average acceleration during contact is?

Raghu Vamshi Hemadri , 9 Years ago
Grade 11
anser 4 Answers
Piyush

Last Activity: 9 Years ago

Divide it into two parts
First find the value of velocity when it will going to collide with the floor let say it is v1
secondly find out the velocity INITIAL ONE for the second part taking your displacement 2.5m let say it is v2
Now take t=0.02s take initial velocity to be equal to (-v1)
final velocity to be equal to v2 apply the first equation of motion and find the acceleration.

Ajithesh

Last Activity: 7 Years ago

g=9.8m/s^2
u=0
v^2/19.6=10
v=14m/s
while bouncing back
0^2-u^2/-19.6=2.5
u^2=49
u=7m/s
time in contact=0.02s
therefore, (v-u)/t=14-7/0.02=350m/s^2
a=350m/s^2

ankita patial

Last Activity: 6 Years ago

V1=√2gh1= √2×9.8×10=√196=14
V2=√2gh2=√2×9.8×2.5=√49=7
a=F/m
F=m[v1-(v2)]/t
a=m[v1-(-v2)]/m×0.02=[14+7]/0.02=2100/2=1050

Hafsa Maheveen

Last Activity: 3 Years ago

According to the given information
As we know
g=9.8m/s 
h1=10
h2=2.5
t=0.02 
 
a=√2gh1-(-√2gh2)/t
a=√2gh1+√2gh2/0.02
a=√2×9.8×10+√2×9.8×2.5
a=√196+√49/7
a=14+7/0.02
a=21/0.02
Therefore //a=1050//

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

Other Related Questions on Mechanics

question mark
A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mmat the free end, where a small mass of 2 g is positioned. determine(i) The velocity of the end when passing through the zero position(ii) The acceleration at maximum displacement(iii) The maximum kinetic energy of the mass
Mechanics
2 Answer Available

Last Activity: 2 Year ago(s)

question mark
An object of mass m = 0.25 kg oscillates in a fluid at the end of a vertical spring of springconstant kH = 85 N/m, see Fig.1. The effect of the fluid resistance is governed by thedamping constant b = 0.07kg/s.(i) Find the period of the damped oscillation.(ii) By what percentage does the amplitude of the oscillation decrease in each cycle?
Mechanics
1 Answer Available

Last Activity: 2 Year ago(s)

question mark
If a=x² find the displacement at t =3sec if body velocity at t= 0 sec is 0
Mechanics
1 Answer Available

Last Activity: 2 Year ago(s)

question mark
A particle is traveling in a circle of radius R =2.5m and with an angular velocity of 10 rad/s. What is the centripetal acceleration of the particle? The particle begins to slow down with an angular acceleration of -1 rad/s2. After 5 seconds, what is the centripetal acceleration and the tangential acceleration fo the particle?
Mechanics
1 Answer Available

Last Activity: 2 Year ago(s)

question mark
If the acceleration of block A is 5 m/s^2Find the acceleration of block B
Mechanics
1 Answer Available

Last Activity: 2 Year ago(s)