# A ball is gently dropped from a height of 20m. If its velocity increases uniformly at the rate of 10 ms-2, with what velocity will it strike the ground? After what time will it strike the ground?

By Ritesh|Updated : November 4th, 2022

A ball is gently dropped from a height of 20m. If its velocity increases uniformly at the rate of 10 ms-2, with 20 m/s velocity it will strike the ground. After 2s it will strike the ground. Steps to find the time will ball strike the ground:

Step 1: It is given that,

• Distance traveled by ball S = 20 m
• Initial velocity u = 0
• Uniform acceleration a = 10 ms-2
• Consider the time taken as t.
• Consider the final velocity as v

Step 2: Now we have to make a final velocity calculation:

Newton's third law of motion states that:

• v2 = u2 + 2as
• v2 = 02 + 2 x 10 x 20
• v = 20 m/s

Step 3: Determine the duration using Newton's first law of motion:

• v = u + at
• t = (v - u)/a
• t = (20 - 0)/10 = 20 m/s/ 10 m/s2
• t = 2s

As a result, the ball will hit the ground at a 20 m/s velocity at a period of 2 s.

Summary:

## A ball is gently dropped from a height of 20m. If its velocity increases uniformly at the rate of 10 ms-2, with what velocity will it strike the ground? After what time will it strike the ground?

A ball is softly dropped from 20m height. It will hit the ground at 20 m/s if its velocity rises uniformly at a rate of 10 ms-2. After two seconds, it will hit the ground. Velocity is the rate of change of position with respect to time. GradeStack Learning Pvt. Ltd.Windsor IT Park, Tower - A, 2nd Floor, Sector 125, Noida, Uttar Pradesh 201303 help@byjusexamprep.com