Question

1. what is the average velocity of a car if it travels from position 25 m to a position of -7 m in 34 seconds ?

Answer 1

1.

x₀ = initial position of the car = 25 m

x = final position of the car = - 7 m

t = time taken by the car = 34 seconds

displacement of the car is given as

d = change in position = x - x₀ = - 7 - 25 = - 32 m

average velocity of the car is given as

V = d/t

V = - 32/34

V = - 0.94 m/s

2.

after the rock is thrown up in air , the only force acting on the rock is force of gravity in down direction. due to this force , the rock experience acceleration in down direction which is known as the acceleration due to gravity. the magnitude of this acceleration is constant and is given as 9.8 m/s²