Question

A car accelerates from 0 to 50mph in 4.5 seconds. The car exerts a force of 4000N. What is the mass of the car?

Answer 1

सत्यमेव जयते नानृतम सत्येन पंथा विततो देवयानः। येनाक्रमंत्यृषयो ह्याप्तकामो यत्र तत् सत्यस्य परमम् निधानम॥

Answer 2

Explanation:

Nahi pata......

Question : Prove that√5 is irrational.

Answer :

Let us assume that √5 is a rational number.

Sp it t can be expressed in the form p/q where p,q are co-prime integers and q≠0

⇒√5=p/q

On squaring both the sides we get,

⇒5=p²/q²

⇒5q²=p² —————–(i)

p²/5= q²

So 5 divides p

p is a multiple of 5

⇒p=5m

⇒p²=25m² ————-(ii)

From equations (i) and (ii), we get,

5q²=25m²

⇒q²=5m²

⇒q² is a multiple of 5

⇒q is a multiple of 5

Hence, p,q have a common factor 5. This contradicts our assumption that they are co-primes. Therefore, p/q is not a rational number

√5 is an irrational number

Hence proved