Question

2. Express 15 m s-' in km h-!
Ans. 54 km h

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Answer 1

Answer:

Given :-

• The speed is 15 m/s.

To Find :-

• What is the speed in km/h.

Solution :-

So, we have to convert m/s into km/h :

$\longrightarrow \sf Speed =\: 15\: m/s$

$\longrightarrow \sf Speed =\: {\cancel{15}} \times \dfrac{18}{\cancel{5}}\: km/h$

$\longrightarrow \sf Speed =\: 3 \times \dfrac{18}{1}\: km/h$

$\longrightarrow \sf Speed =\: \dfrac{3 \times 18}{1}\: km/h$

$\longrightarrow \sf Speed =\: \dfrac{54}{1}\: km/h$

$\longrightarrow \sf\bold{\red{Speed =\: 54\: km/h}}$

$\therefore$ The speed is 54 km/h .

EXTRA INFORMATION :-

$\bigstar\: \: \sf\boxed{\bold{\pink{Equation\: Of\: Motion\: :-}}}$

❶ First Equation Of Motion :

$\leadsto \sf\bold{\purple{v =\: u + at}}$

❷ Second Equation Of Motion :

$\leadsto \sf\bold{\purple{s =\: ut + \dfrac{1}{2}at^2}}$

❸ Third Equation Of Motion :

$\leadsto \sf\bold{\purple{v^2 =\: u^2 + 2as}}$

where,

• s = Distance Covered
• u = Initial Velocity
• v = Final Velocity
• a = Acceleration
• t = Time

Answer 2

Solution :-

$\sf{ ⟹ \: \frac{60 \times 60}{1000} } = \frac{3600}{1000}$

$\sf{⟹ \frac{10}{5} }$

Direct Method of conversion :-

$\sf{ \sf \: 15 m/s \times \frac{18}{5}}$

$\sf{⟹ 3 × 18 = 54 km/hr} \:$

$\sf{ 54 km/hr × \frac{5}{18} }$

$\sf{ ⟹ 3 × 5 = 15 m/sec} \:$

Now ,

$\sf{ 15 m/s = \frac{15 \times 60 \times 60}{1000} } \: km/hr \: = 54 \: km/hr$

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