Q7 of 14 Page 16

Solve the following examples.

A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed?

2.25 m/s


The average speed is given as:



⇒


⇒


⇒


Therefore, the average speed is 2.25 m/sec


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Solve the following examples.

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Solve the following examples.

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Solve the following examples.

A bullet having a mass of 10 g and moving with a speed of 1.5 m/s, penetrates a thick wooden plank of mass 90 g. The plank was initially at rest. The bullet gets embedded in the plank and both move together. Determine their velocity.