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

a. 94.444 m/s

b. 0.001 s

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* (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 =(distance)/(speed)`

• 
  `\implies Time =(10)/(9444.4)`

• 
  `\implies Time =0.00105882851 \: s`

• 
  `\implies Time \approx 0.001\: s`