Peacock mantis shrimp feed largely on snails. They shatter the shells of their prey by delivering a sharp blow with their front legs which has been to reach a peak
speed of 23m/s. What is the speed is kilometers per hour?

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

b. a lightning bug, plug of grass, and a worm

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.