3.1.1 1.1.5.1 I You drop a rock into a bottomless pit. What is the speed of...

Question

Question

Answer 1

Answer #1

Given,

Initial velocity of rock, u=o since drop

Time,t=4 sec

Final velocity of rock, =?

Formula: v= u+at

Where, $a=-9.8 m/s^{2}$

Now v=0+(-9.8)4=-39.2 m/s

Speed of rock 4 seconds later is, v=-39.2 m/s

Here negative sign for velocity represents it is moving towards negative Y- axis or downward from point of drop.

Negative sign for acceleration is also the same meaning.

Answer 2

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