The average velocity of the body is 10m/s and final velocity is 20m/s then initial velocity of the body is
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10
Answer:
average velocity=u+v/2
10=u+20/2
20=u+20
u = 0 m/s
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1
Answer:
- In order to answer this question, we must apply newton's first equation of motion
- v = u + at
- Where v is the final velocity in m/s, which is we shall attempt to find,
- u is the initial velocity in m/s, given in the question as 20m/s
- a is the acceleration of the body in m/s2, in the question, it is indicated to be 4m/s2
- t is the time in seconds, from the question, it is 4s.
- v = 20 + 4*4
- v = 20 + 16 = 36m/s
- As for the distance, either the second or third equation of motion can be used.
- Using the second equation,
- s (distance) = u*t + 0.5*a*(t^2)
- s = 20*4 + 0.5*4*(4*4)
- s = 80 + 32 = 112m
- Using the third equation of motion,
- v2 = u2 + 2as
- 36^2 = 20^2 + 2*4*s
- 1296 = 400 + 8 * s
- 8*s = 1296 - 400 = 896
- s = 896/8 = 112m
Explanation:
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