Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
14.4k views
in Rotational motion by (65.8k points)
recategorized by

Statement -1 — If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant. 

Statement -2 — The Linear momentum of an isolated system remains constant. 

(A) Statement - 1 is correct (true), Statement - 2 is true and Statement- 2 is correct explanation for Statement - 1 

(B) Statement -1 is true, statement -2 is true but statement-2 is not the correct explanation four statement -1. 

(C) Statement - 1 is true, statement-2 is false 

(D) Statement-2 is false, statement -2 is true

1 Answer

+1 vote
by (71.2k points)
selected by
 
Best answer

Correct option: (D) Statement-2 is false, statement -2 is true

Explanation:

The velocity of centre of mass remains constant if no external force acts on the body. 

External torque (τ = r × F) can be zero if F is finite but vectors r × F are parallel to each other. Hence statement 1 is false. Also Linear momentum is always conserved.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

...