Two people use a ramp to move a heavy box on to a truck. The box weighs 750 N the mechanical advantage of the ramp is 4. How much effort is needed to move the box

The amount of effort needed to move the box is 187.5 N

Explanation:

weight of the box = load moved by the ramp, L = 750 N

mechanical advantage of the ramp, MA = 4

effort needed to move the box, E = ?

Mechanical advantage is given as = Load / Effort

Effort = Load / Mechanical advantage

Effort = 750 / 4

Effort = 187.5 N

Therefore, the amount of effort needed to move the box on to the truck using a ramp is 187.5 N

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft

the right answer is 0.3 meters per second