Question

Help plz I don't understand ​

Answer 1

#78

Airplane start with initial speed

`v_i = 0`

now the takeoff velocity is given as

`v_f = 300 km/h`

`v_f = 83.33 m/s`

acceelration is given as

`a = 1 m/s^2`

now we have

`v_f - v_i = at`

from above equation we have

`83.33 - 0 = 1(t)`

`t = 83.33 s`

#79

Airplane start with initial speed

`v_i = 0`

now the takeoff velocity is given as

`v_f = 300 km/h`

`v_f = 83.33 m/s`

acceelration is given as

`a = 2 m/s^2`

now we have

`v_f - v_i = at`

from above equation we have

`83.33 - 0 = 2(t)`

`t = 41.7 s`