SELECT * FROM question_mgmt as q WHERE id=3356 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=8 AND chapterId=104 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms–1. How long does the body take to stop?

Answer:

Retarding force, F = -50 N

Mass of the body, m= 20 kg

Initial velocity of the body, u= 15 m/s

Final velocity of the body, v= 0

UsingNewton's second law of motion, the acceleration (a) produced in the body can be calculated as:

F= ma

-50 = 20 × a

∴ a  = -50 / 20  =  -2.5 m/s2

Usingthe first equation of motion, the time (t) taken by the body to come to rest can be calculated as:

v= u + at

∴ t  =  -u /a  =  -15 / -2.5   = 6s


< Previous Question

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='8' AND ex_no!=0 AND status=1 and id!=3356 ORDER BY views desc, last_viewed_on desc limit 0,10

  • Popular questions of class 11 Physics

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='8' AND ex_no!=0 AND status=1 and id!=3356 ORDER BY last_viewed_on desc limit 0,10

  • Recently Viewed Questions of Class 11 Physics

Comments

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

Comment(s) on this Question


Important links

Quick Links

Resources

Support