First slide

Work Energy Theorem

Question

A body of mass 2kg has an initial speed 5ms^–1. A force acts on it for 4 seconds in the direction of motion. The force time graph is shown in figure. The final speed of the body is

Moderate

A

8.5 ms^–1
B

11 ms^–1
C

14.31 ms^–1
D

4.31 ms^–1

Solution

Area under F-t curve gives impulse.
$J = Δp = m (v - u)$

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