An object in a uniform motion ___.

Peter wants to modify the formula for acceleration
i.e., a = (v – u)/ t
Where v = final velocity, u = initial velocity, t= time, a = acceleration, to suit the special case of freefall of a ball dropped from the top of a building. He chooses to make the following substitutions in the formula.
a. v= 0
b. u= 0
c. a= 9.8 m/s²
Identify the correct substitutions.

A car is moving at a speed of 5 m/s in the same direction throughout its motion. Which of the following is true about its motion?

Which of the following value(s) can distance take?

An object falling from the top of a building reaches a velocity of ___ m/s in 20 s.

A train starts from rest and picks up a velocity of 20 m/s in 4 s. The acceleration of the train is ___ m/s².

A car is moving at a speed of 20 m/s towards east. In which of the following cases its velocity is said to be changed?

A person runs around a square park of side 10 m, 4 times. What is the distance and displacement covered by the person ?

The driver of a car moving at a velocity of 50 m/s applies brakes and eventually stops after 10 s. What is the acceleration of the car?

An object is moving in a non-uniform motion. Which of the following physical quantities gives the measure of the rate of motion?

Which of the following remains constant in a uniform circular motion?

Which of the following is constant during a uniform circular motion?

The velocity of a body changes when ___.

A car moves at a speed of 3 m/s. What is its acceleration?

In which of the following cases a body is said to be accelerating ?

 

 

Negative acceleration is known as deceleration.