NCERT 2022 | बल तथा गति के नियम - L3 | जडत्व | CLASS 9 - विज्ञान | 9 AM Class by Subhadra Ma'am

Two cars A and B leave Delhi at 8:30 a.m. and 9 a.m. for Shimla, respectively. They travel at the speeds of 40km/h and 50 km/h respectively. How many kilometres away from Delhi will the two cars be together? दो कारें A तथा B दिल्ली से क्रमशः 8: 30 a.m एवं 9 a.m में शिमला जाने के लिए खुलती है | वे क्रमशः 40 किमी/घंटा तथा 50 किमी/घंटा की चाल से यात्रा करती हैं | दोनों कारें दिल्ली से कितने किलोमीटर की दूरी पर एक साथ होंगी ?

Consider the marks, out of 100, obtained by 51 students of a class in a test, given in Table 14.9. M a r k s"N u m b e r o f S t u d e n t s"0-10 5 10-20 10 20-30 4 30-40 6 40-50 7 50-60 3 60-70 2 70-80 2 80-90 3 90-100 9Tot a l 51 Draw a freque

A train leaves P at 9 am with speed of 30 km/h. Another train leaves Q at 11 am with speed of 45 km/h. The trains are travelling towards each other on parallel tracks. Distance between P and Q is 300 km. When they meet, what is the ratio of the distances covered by them? एक ट्रेन सुबह 9 बजे 30 km/h की गति से P से निकलती है। एक अन्य ट्रेन सुबह 11 बजे 45 km/h की गति से Q से निकलती है। ट्रेनें समानांतर पटरियों पर एक-दूसरे की ओर जा रही हैं। P और Q के बीच की दूरी 300 km है। वे कब मिलेंगीं, एवं उनके द्वारा तय की गई दूरियों का अनुपात कितना होगा?

The above Venn diagram represent the students who play 3 sports M, N and L in a class Total number of students who play N & L but not M game is: Options are (a) 15 (b) 68 (c) 9 (d) 12.

A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.0 3.7 3.2 2.2 4.1 3.5 4.5 3.5 2.3 3.2 3.4 3.8 3.2 4.6 3.7 2.5 4.4 3.4 3.3 2.9 3.0 4.3 2.8 3.5 3.2 3.9 3.2 3.2 3.1 3.7 3.4 4.6 3.8 3.2 2.6 3.5 4.2 2.9 3.6 Construct a grouped frequency distribution table for this data, using class intervals of size 0.5 starting from the interval 2 - 2.5.

Factorise the expressions. (i) ax^2 + bx (ii) 7p^2 + 21q^2 (iii) 2x^3 + 2xy^2 + 2xz^2 (iv) am^2 + bm^2 + bn^2 + an^2 (v) (lm + l) + m +1 (vi) y(y+z) + 9(y+z) (vii) 5y^2 - 20y - 8z + 2yz (viii) 10ab + 4a + 5b +2 (ix) 6xy - 4y + 6 - 9x

Below there is a conversation between a teacher and student of class 3rd on the topic Air Teacher:What will happen if there is unclean or polluted air in the whole world Student I:Ma'am will not get proper oxygen to breathe in StudentII:There will be no animals ,insectes etc Teacher:So what we will do? Student III:Ma'am for fresh air we have to plant more or more trees and stop using personal vehicle for traveling this interaction shows that students are good in

Find the quartile deviation for the following grouped data. {:("Class Interval",f),(" "0-4,1),(" "5-9,3),(" "10-14,2),(" "15-19,4),(" "20-24,5),(" "25-29,3),(" "30-34,2),(" "35-39,4),(" "40-44,3),(" "45-49,3):}