InterviewSolution
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InterviewSolution
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a) Write the three equations of uniformly accelerated motion. Given the meaning of each symbol which occurs in them. b) A car acquires a velocity of 72 km/h in 10 s starting from rest. Find i) the acceleration ii) average velocity iii) the distance travelled in this time |
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Answer» a) The first equation of motion is v = u + at Where, v is the final velocity of the body u is the initial velocity of the body a is the acceleration t is the time taken The second equation of motion is s = ut + ½ at2 Where, s is the distance travelled by the body t is the time taken u is the initial velocity a is the acceleration The third equation of motion is v2 – u2 = 2as Where, v is the final velocity of the body u is the initial velocity of the body a is the acceleration s is the distance travelled by the body b) Initial velocity, u = 0 m/s Final velocity, v = 72 km/h = 20 m/s Time, t = 10s i) Acceleration = final velocity – initial velocity/time taken a = v-u/t = 2 m/s2 ii) Average velocity = initial velocity + final velocity/2 Average velocity = 10 m/s iii) Distance travelled = (average velocity)(time) = 100m |
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