Question
A ball is dropped from a height of 120 metres. After each
bounce, it rises to one-fourth of the height from which it fell. What is the total distance the ball travels before coming to rest?Solution
Distance travelled in 1 st  fall = 120 m
Height to which the ball will rebound in 1 st  fall = 120/4 = 30 metres
Height to which the ball rebounds in 2 nd  fall = 30/4 = 7.5 metres
Therefore, distance travelled by ball = 120 + 30 + 30 + 7.5 + 7.5……. upto infinity
= 120 + 2 Ă— (30 + 7.5 + up to infinity)
= 120 + 2 × 30/{1 – (1/4)} [sum of infinite G.P. = a/(1 – r)]
= 120 + 60 Ă— 4/3 = 120 + 80 = 200 metres
Which of the following is responsible for hiding of the data?
Who became the President of Indonesia in October 2024?
A device that provides surge protection and battery backup is called _______. Â
Which memory is used as temporary memory?
Which is not a computer language?
The first computer virus is
Processor bus is also known as _____________
Switch, a small hardware device, forwards each incoming packet to ________.Â
Which generations computers operate Artificial Intelligence technology and ULSI Technology?Â
What are external devices like printers and scanners, which are not part of the main computer system, called?
Relevant for Exams:
