Question

5 Air bags in a car 'explode' at 340 km/h.
a Convert this to metres per second.
b How long would the air bag take to move 10 cm?
Give your answer to the nearest thousandth of a second.​

Answer 1

Answer:

a. 94.444 m/s

b. 0.001 s

Step-by-step explanation:

• We know that:
• 1 km = 1000 m & 1 h = 3600s

#a

• Explosion speed of air bag = 340 km/h

• -> Explosion speed of air bag $= 340\times \frac{1000\: m}{3600 \:s}$

• -> Explosion speed of air bag $= 94.444\: m/s$

#b

• Speed = 94.444 m/s = 9444.4 cm/s
• Distance = 10 cm
• Formula relating time speed and distance is given as:

• $Time =\frac{distance}{speed}$

• $\implies Time =\frac{10}{9444.4}$

• $\implies Time =0.00105882851 \: s$

• $\implies Time \approx 0.001\: s$