Question

A tennis ball is thrown upwards from the edge of a cliff with a speed of
10 m/s. It lands on the ground below the cliff
3.0 seconds later. We can ignore air resistance.
What is the displacement of the tennis ball?
Answer using a coordinate system where upward is positive.
Round the answer to two significant digits.

Answer 1

-15 Meter is your Answer

First, the ball will go up so we would be dividing Ball's whole journey into two parts i.e

• (when we throw ball up and when the ball returnes down at the height it was thrown) and calculate the time taken by the ball

Note:- During 1st path initial Velocity is given I.E 10 M/S

and it would also be its final velocity for 1st Half So,

Initial Velocity= Final Velocity ( For first half of the journey)

So For First Half of journey

we have,

•Initial Velocity= 10m/s

•Final velocity= -10m/s

•Acceleration (Due to gravity)= 20m/s²

ATQ,

V=U+AT

-10=10+ -10×t

-20= -10t

• t=2 sec (for its first half of the journey)

Now, for it's Second half of the journey

Final velocity of first journey= initial velocity for second journey

Now, We have,

•Initial velocity= -10m/s

•Time= total time- time taken for first half of the journey

i.e T= 3-2

so,

T= 1sec (for second journey)

•Accelaration (due to gravity) :- 10m/s²

By,

S=UT+1/2AT²

S= -10 +1/2×-10×(1)²

S = -10+ (-5)

S= -15 Meters

Thus, displacement of tennisball is -15meters

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Answer 2

Step-by-step explanation:

A tennis ball is thrown upwards from the edge of a cliff with a speed of

10 m/s. It lands on the ground below the cliff

3.0 seconds later. We can ignore air resistance.

What is the displacement of the tennis ball?

Answer using a coordinate system where upward is positive.

Round the answer to two significant digits.