Question

If the speed of the car is halved, how does the kinetic energy change?

(a) Determine the work done by the force $F$ in moving the block $x5m$ along the slope.

Answer 1

The kinetic energy $=1/2\times m\times v^2$

If the velocity is halved, the kinetic energy will also decrease to $1/4th$of its original value as the velocity is directly proportional to the kinetic energy.

Given the distance travel along the slope$=5m$

(a) Force applied$=F$

The work done in moving the block 5m along the slope is:

Work done$=F\times s$

$=F\times 5$

$=5FJ$