Asked/Added Questions From NCERT:


Master Mind

रायफल का द्रव्यमान M = 4 kg 

गोली का द्रव्यमान m = 50 g = 0.050 kg 

गोली का प्रारंभिक वेग u = 0 ms-1 

गोली की अंतिम वेग v = 35 ms-1 

राइफल का प्रारंभिक वेग U = 0 ms-1  

राइफल का प्रतिक्षेपित वेग V = ? 

गोली छूटने के पहले का संवेग = MU + mu 

                                  = 4 × 0  + 0.050 × 0

                                  = 0 kg ms-1 

गोली छूटने के बाद का संवेग = MV + mv 

                                = 4 × V + 0.050 × 35 

                                = 4V + 1.750  kg ms-1 

संवेग संरक्षण के नियम से 

गोली छूटने के बाद का संवेग  = गोली छूटने के पहले का संवेग

4V + 1.750 = 0 

4V = - 1.750 

V = - 1.7504 = - 0.4375 ms-1  

-Answered by Master Mind On 30 September 2020:03:59:53 AM

Question 2. Asked on :05 October 2019:10:39:04 AM

Write the First Law of motion.

-Added by Himanshi Verma Science » Force And Laws Of Motion


Nishant Verma

An object will be in rest or in motion until unbalanced force applied on it.

An object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.

-Answered by Nishant Verma On 06 October 2019:09:09:08 AM

Question 3. Asked on :15 January 2019:05:44:19 PM

 A bullet is fired from a rifle the kinetic energy of the rifle in comparison to that of the bullet is

-Added by Sumitra Mahajan Science » Force And Laws Of Motion


Master Purushottam

a) more than one b) less than one c) equal to one d) zero

M -mass of life
v- velocity of rifle
m -mass of bullet
u -velocity of bullet
Since m < M
Therefore KineticenergyofrifleKineticenergyofbullet<1
Hence b is the correct answer. Hence b is the correct answer. 

-Answered by Master Purushottam On 24 August 2019:12:12:30 AM

Question 4. Asked on :13 January 2019:04:49:55 PM

 A tortoise moves a distance of 100m in 15min. What is its average speed in km/hr?

-Added by Himanshi Verma Science » Force And Laws Of Motion


Master Purushottam

Given:  Tortoise moves 100 meters in 15 minutes.

Therefore, Average Speed = 100 meters /15 minutes  

(as Speed = Distance/time)

                                                    = 0.10 Km/ 0.25 hours

 (as 1 Km

= 1000 m and 1 hour = 60 min)

                                                     = 0.4 Km/hour

Answer – The average speed of tortoise is 0.4 Km/hour

-Answered by Master Purushottam On 23 August 2019:11:38:55 PM


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