Table of Contents

## At what velocity will it hit the ground?

Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.

### What is the resultant velocity?

The resultant velocity of an object is the sum of its individual vector velocities. ■ The sum of the vector forces on an object is equal to the scalar product of the object’s mass and its acceleration vector.

#### How do you find velocity before hitting the ground?

Calculate the final free fall speed (just before hitting the ground) with the formula v = v₀ + gt = 0 + 9.80665 * 8 = 78.45 m/s . Find the free fall distance using the equation s = (1/2)gt² = 0.5 * 9.80665 * 8² = 313.8 m .

**What is the velocity of the ball at the highest point?**

(b) At the highest point of its motion the velocity of the ball will be zero but the acceleration due to gravity will be 9.8 m s –2 acting vertically downward. (i) During upward motion of the ball before reaching the highest point position ,x = +ve, velocity, v = -ve and acceleration, a = +ve.

**What is the difference between initial speed and initial velocity?**

Initial velocity is often incorrectly referred to as initial speed, but the correct term is usually velocity since it represents the magnitude of a vector and therefore has direction. Speed, on the other hand, is a scalar value and does not indicate direction.

## What is the speed of train A and B in speed?

Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km h–1 in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by 1 m s–2. If after 50 s, the guard of B just

### What is the formula to find the acceleration of a ball?

(i) During upward motion of the ball before reaching the highest point position ,x = +ve, velocity, v = -ve and acceleration, a = +ve. (ii) During the downward motion of the ball after reaching the highest point position, velocity and acceleration all the three quantities are positive.