Calculate the correct value below:
A \(10.0\ kg\) block is moving on horizontal floor with negligible friction. As shown in the image below, a variable force is applied on the block in its direction of motion from its position at \(0\ m\) till \(4\ m\). If the block had a kinetic energy of \(180\ J\) when it was at \(0\ m\), find the block’s speed.
Graphical representation
i. A positive area under a force–displacement graph indicates that:
ii. At \(0\ m\) \(=\) \(m/s\)
iii. At \(4\ m\) \(=\) \(m/s\)
iv. Does the block have negative acceleration in any portion of its motion?
[Note: Enter the answer upto two decimal places.]