Question
A body is projected vertically upwards with a velocity
of 98 m/s. The time interval during which it is at a height greater than 392 m is: (Take g = 9.8 m/s²)Solution
Maximum height H = u²/2g = 98²/(2 × 9.8) = 490 m Using the equation h = ut − (1/2)gt², set h = 392 Solve 98t − 4.9t² = 392 ⇒ 4.9t² − 98t + 392 = 0 Solving the quadratic gives roots t₁ = 4s, t₂ = 12s So, height > 392 m for time interval t = 12 − 4 = 8s.
Which number will replace the question mark (?) in the following number series?
5, 7, 9, 11, 18, ?, 34, 35, 59, 67
Find the next number in the series.
17, 25, 52, 116, 241, 457, ?
Select the correct option that indicates the arrangement of the given words in the order in which they appear in an English dictionary.
1. Doctor...
Statement: FR ≥ S
Conclusions:
i) L > S
ii) L > R
Select the correct option from the following.
(a) Only conclusion...
Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.
Which option figure would come next in the following figure series?
Statements: All computers are laptops. Some laptops are heavy. All heavy is wood.
Conclusion I: All laptops are computers.
Conclusion II: ...
In a certain code language, 'COURAGE' is written as 'VPDQFHB' and 'MAGICAL' is written as 'HBNHMBD'. How will 'HOSTELS' be written in that language?
96 is related to 16 following a certain logic. Following the same logic, 156 is related to 26. To which of the following is 228 related following the sa...
What will come in place of the question mark (?) in the following equation if '-' and '+' are interchanged and '÷ ' and '×' are interchanged?
2...
Relevant for Exams:
