Question

7. A truck running along a straight line increases its speed uniformly from 30m/s to 60 m/s over a time interval of 1 min. The distance travelled during this time interval is
(a) 900 m. (b) 1800 m. (c) 2700 m. (d) 3600 m

Answer 1

Answer:

option c.. 2700 m

Explanation:

v = u + at

60 = 30 + a60

30 = a60

a=0.5

v^2 - u^2 = 2as

60×60 - 30×30 = 2 × 0.5 × s

2700 = s

Answer 2

Answer:

2700 m

Explanation:

Let distance, initial velocity, final velocity and time be s, u, v, and t respectively.

u = 30 m/s

v = 60 m/s

t = 1 min = 60s

a = (60 - 30)/60 = 0.5 m/s^2

Using third equation of motion,

v^2 - u^2 = 2as

=> s = (60^2 - 30^2)/2×0.5 = (3600 - 900) = 2700 m

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