8. A woman who doesn't appreciate the improper advances of a rude thug blasts him with some pepper spray. She then screams. The frequency of
her scream is a piercing 1,000 Hz on an evening when the air temperature
is a brisk 10°C. If the thug starts sprinting away from the woman at a
speed of 7 m/s what frequency will he hear?

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards