Question

Q. A ball hits a wall horizontally at 10 m/s. It bounce horizontally at 6
m/s. The ball is in contact with the wall for 0.2 sec. Find out its
acceleration.​

Answer 1

Answer:

zero is the answer since the ball is moving and returning back to the same position after going upwards hence the displacement is 0

Answer 2

Answer :

• Acceleration of ball is - 20

Given :

• A ball hits a wall horizontally at 10 m/s
• It bounce horizontally at 6 m/s
• The ball is in contact with the walla for 0.2 sec

To find :

• Acceleration of ball

Solution :

Given,

• Initial velocity (u) = 10m/s
• Final velocity (v) = 6 m/s
• Time (t) = 0.2 seconds

As we know that,

• a = v - u / t

Where , a is acceleration, v is final velocity , u is Initial velocity and t is time

》a = v - u / t

》a = 6 - 10 / 0.2

》-4/0.2

》-20

Hence , Acceleration of ball is - 20

Verification :

》a = v - u / t

》-20 = 6 - 10 / 0.2

》-20 = -4/0.2

》-20 = -20

Hence , Verified