1.

⠀→ A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 m s⁻² for 8.0 s. How far does the boat travel during this time ?​

Answer»

Solution -

We have,

  • Initial velocity (u) = 0
  • Time (t) = 8.0 s
  • Acceleration (a) = 3.0 ms⁻²

In this question, we have to FIND the distance TRAVELLED by the boat during the GIVEN time.

We will use the SECOND equation of MOTION, i.e.,

\bf\longmapsto{\boxed{\pink{s = ut + \dfrac{1}{2}at^2}}}

Here,

  • s = distance travelled
  • u = initial velocity
  • t = time taken
  • a = acceleration

Putting values in the formula

\sf\dashrightarrow{s = 0 \times 8.0 + \dfrac{1}{2} \times 3 \times (8.0)^2}

\sf\dashrightarrow{s = 0 + \dfrac{3}{2} \times 64}

\sf\dashrightarrow{s = 3 \times 32}

\frak\dashrightarrow{\purple{s = 96\:m}}

\small\underline{\sf{Thus,\: the\: boat\: travels\: a\: distance\: of\: 96\: metres.}}



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