Question

1. a student pushes a box up a ramp that is 3 meters long and 1.2 meters high. if the box weighs 150 n, calculate the useful work done in lifting the box. 9.8×150 = 1470×1.2 = 1764×3 = 5292

Explanation:

Step1: Recall work - formula

The formula for useful work in lifting an object is $W = Fd$, where $F$ is the force and $d$ is the displacement in the direction of the force. When lifting an object, the force required is equal to its weight and the displacement is the height.

Step2: Identify values

The weight of the box $F= 150\ N$ and the height $d = 1.2\ m$.

Step3: Calculate work

$W=F\times d=150\times1.2$.
$W = 180\ J$.

Answer:

$180\ J$