pratyush5
A body looses half of its velocity while penetrating 3 cm into a wooden block, then how much will it penetrate more before finally coming to rest. Please explain
Delete
Share
This Question is Closed
pratyush5
Best Response
You've already chosen the best response.
0
@ashwinjohn3 @yrelhan4 @uri
pratyush5
Best Response
You've already chosen the best response.
0
i have got the answer but i want to know a proper method
yrelhan4
Best Response
You've already chosen the best response.
0
newtons law of motion will do it for you!
pratyush5
Best Response
You've already chosen the best response.
0
i used v^2 - u^2 = 2as
pratyush5
Best Response
You've already chosen the best response.
0
i just need to know what should i take for acceleration
or should i ignore it
ashishthomas7
Best Response
You've already chosen the best response.
1
u must find the acceleration dude....
ashwinjohn3
Best Response
You've already chosen the best response.
0
Ok....Acceleration is negative since it is slowing down.....
pratyush5
Best Response
You've already chosen the best response.
0
ya sure
ashishthomas7
Best Response
You've already chosen the best response.
1
here v=u/2,and use the equation v^2=u^2-2as
ashishthomas7
Best Response
You've already chosen the best response.
1
then u will get accelration
ashishthomas7
Best Response
You've already chosen the best response.
1
then finally equate v=0,a=obtained from above and find s!!!
ashishthomas7
Best Response
You've already chosen the best response.
1
since here the question asked is "how much more will it penetrate" initial velocity=u/2...
pratyush5
Best Response
You've already chosen the best response.
0
i am getting a= -u^2/8
pratyush5
Best Response
You've already chosen the best response.
0
is dat right
?
yrelhan4
Best Response
You've already chosen the best response.
0
yup..
ashishthomas7
Best Response
You've already chosen the best response.
1
yup....
pratyush5
Best Response
You've already chosen the best response.
0
there fore the equation for finding "s" should be|dw:1359144797548:dw| right
pratyush5
Best Response
You've already chosen the best response.
0
so i get s=1 cm
ashishthomas7
Best Response
You've already chosen the best response.
1
i got that too...
pratyush5
Best Response
You've already chosen the best response.
0
correection |dw:1359144893116:dw|
pratyush5
Best Response
You've already chosen the best response.
0
thnku all
ashishthomas7
Best Response
You've already chosen the best response.
1
your welcome....
yrelhan4
Best Response
You've already chosen the best response.
0
yes.. i was wondering whats wrong. so s=4cm. it penetrates 1cm more.