Question

.Starting from rest from one end of a runway, a jet airliner acquires a speed of 90 m/s in 1 minute.
Express your idea about how much acceleration it attains and evaluate the distance travelled. Also, we
know that seat belts help to keep drivers and passengers safer when the vehicles stop suddenly during an
accident. Justify the statement based on your observations.

Answer 1

Answer:

u = 0m/s

v = 90m/s

t = 60s

a

= (v-u)/t

= (90-0)/60

= 90/60

= 3/2 m/s^2

= 1.5 m/s^2

Using the Third Equation of Motion,

v^2 - u^2 = 2as

90^2 - 0^2 = 2(1.5)(s)

8100 = 3s

s = 8100/3

s = 2700m or 2.7km.

Inertia of motion is the ability of an object to resist any change in its motion. When the passengers and drivers are sitting in the jet liner and it suddenly stops, the passengers are thrown forward due to inertia of motion which keeps them moving with respect to the jet liner, momentarily. This throwing forward may result in a accident to prevent which seatbelts are used.