Question
What is the escape velocity from the surface of the
Earth?Solution
Escape velocity ve = √2gR, where g = 9.8 m/s² and R = 6400 km. Calculating this gives approximately 11.2 km/s. This is the minimum speed needed for an object to escape Earth’s gravitational field without further propulsion.
The ratio of A's age to B's age after 18 years will be 5:6. Seven years ago, the ratio of their ages was 5:7. Find the present average age of A and B.
20 years ago, the age of ‘I’ was 50% more than ‘J’. If the sum of their present ages is 90 years, then find the present age of ‘I’.
...The present age ratio of Anshul to Pawan is 5:7, and that of Chinky to Diksha is 3:2. A decade ago, the ratio of Anshul’s age t...
A is 4 years older than B while C is 6 years younger than B. The ratio of age of A, 5 years hence and age of B, 3 years ago is 3:2. What was age of C, 6...
The ratio of age of A and his son is 8:5. If the difference of their ages 8 year ago is 15, then find the sum of ages of A and his son 10 year hence.
The ratio of ages of P and Q, after 8 years will be 19:14 respectively. The present average age of P, Q and R is 52 years. If present age of R is 25% mo...
Amit age after 20 years will be 4 times his age 4 years back. What is the present age of Amit?
Five years back, the age ratio of Meera and Sanya was 11:13. Five years from now, the ratio becomes 13:15. What is the average of their present ages?
- The present ages of Arun and Varun are in the ratio 1:2. 5 years ago, the average age of Arun, Varun, and Kiran was 25 years. At that time, Arun was 10 yea...
The current average age of 'Akhil', 'Bittu', and 'Chinu' is 42 years. 'Bittu's' age is 25% greater than 'Akhil's'. Twelve years from now, the age ratio ...
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