Question

In how many of the following situations does the car have a westward acceleration?
-- The car travels westward at constant speed.

-- The car travels eastward and speeds up.

-- The car travels westward and slows down.

-- The car travels eastward and slows down.

-- The car starts from rest and moves toward the east.
a.
1
b.
2
c.
3
d.
4
e.
5

Answer 1

(i) The car travels westward at constant speed

Since car is traveling at constant speed, So acceleration of car is zero in this case

(ii) The car travels eastward and speeds up

Since car is moving towards east and also given that speed of car is increasing, which means acceleration is in the same direction of motion, which means direction of acceleration is towards the east

(iii) The car travels westward and slows down

Since car is moving towards west and also given that speed of car is decreasing, which means acceleration is in the opposite direction of motion, which means direction of acceleration is towards the east.

(iv) The car travels eastward and slows down

Since car is moving towards east and also given that speed of car is decreasing, which means acceleration is in the opposite direction of motion, which means direction of acceleration is towards the west.

(v) The car starts from rest and moves toward the east.

Since car starts from rest and is moving towards east, which means speed of car is increasing, and acceleration is in the same direction of motion, which means direction of acceleration is towards the east.

Correct option is D. Situation (iv)