Question
A constant retarding force of 20 N is applied to a body
of mass 10 kg moving initially with a speed of 12 m s–1. How long does the body take to stop?Solution
Given that Retarding force, F = – 20 N Mass of the body, m = 10 kg Initial velocity of the body, u = 12 m /s Final velocity of the body, v = 0 Using Newton’s second law of motion, the retardation (a) produced in the body can be calculated as: F = ma – 20 = 10 × a ∴ a = −20/10 = − 2 m/s2 Using the first equation of motion, the time (t) taken by the body to come to rest can be calculated as v = u + at ∴ t = -u/a = −12/−2 = 6 seconds Hence time taken by the body to come to rest is 6 seconds
The character of a special plant variety ,”Antibiosis” refers to:
Which of the following is a key challenge in sales and distribution management for Agribusinesses?
The adoption and widespread use of high-yielding variety (HYV) seeds, chemical fertilizers, and irrigation technology in Indian agriculture is collectiv...
Government of India has announced MSP for how many commercial crops till 2023?
Which of the following statements is/are true?
Statement A :Cool and humid, warm and humid climatic conditions are favorable podzolization and la...
Which one of the following offers least liquidity:
Which factors are most important in determining the water- holding capacity of soil?
What term describes the interaction where one organism kills and eats another organism?
Millets are a highly varied group of small-seeded grasses, widely grown around the world as cereal crops or grains for fodder and human food. Which is n...
What type of tillage implement is a disc harrow?
Relevant for Exams:
