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
2.3k views
in Physics by (41.2k points)
closed by
Two bodies A and B have masses 20 kg and 5 kg respectively. Each one is acted upon by a force of 4 kg wt. If they acquire the same kinetic energy in times `t_A` and `t_B`, then the ratio `t_A/t_B` is
A. `1/2`
B. 2
C. `2/5`
D. `5/6`

1 Answer

0 votes
by (57.1k points)
selected by
 
Best answer
Correct Answer - B
Here, `m_1=20 kg, m_2= 5 kg` , Force = 40 N
`therefore a_1=2 m s^(-2) and a_2=8 m s^(-2)`
`1/2m_1(a_1t_A)^2=1/2m_2(a_2t_B)^2`
`therefore 20 xx 4 xxt_A^2 = 5 xx 64 xx t_B^2`
`therefore t_A^2/t_B^2 =(5xx64)/(20xx4)=4/1 "" or "" t_A/t_B=2`

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.

Categories

...