CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in m/s)

A
24
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
32
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
18
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
9
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 18

Potential energy of a body = 75 % of 12 J
mgh = 9 J h = 91×10 = 0.9m
Now when this mass allow to fall then it acquire velocity
v = 2gh = 2×10×0.9 = 18 m/s.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
The Law of Conservation of Mechanical Energy
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon