wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

In the given constraint, if the string is inextensible and pulley is frictionless, then magnitude of velocity of block A (VA) is

A
10 m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
20 m/s
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
15 m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
5 m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 20 m/s

Velocity of pulley, VP=VA+VB2
Putting VP=10 m/s,VB=0,
we get
VA=20 m/s (upward direction)

Alternative solution:

Since the string is inextensible, therefore
Xp+(XPXA) = length of string
2XpXA=L
Differentiating w.r.t time, we get equation in terms of velocity i.e.
2VpVA=0
VA=2VP
VA=2(10)=20 m/s

flag
Suggest Corrections
thumbs-up
3
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
All Strings Attached
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon