Q7 of 14 Page 16

Solve the following examples.

An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is its average speed?

We know,



⇒ Average speed =


=


= 6m/s


∴ the average speed is 6 m/sec.


More from this chapter

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5

Give scientific reasons.

The velocity of an object at rest is considered to be uniform.

 6

Take 5 examples from your surroundings and give explanation based on Newtons laws of motion.

 7

Solve the following examples.

An object of mass 16 kg is moving with an acceleration of 3 m/s2. Calculate the applied force. If the same force is applied on an object of mass 24 kg, how much will be the acceleration?

 7

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.