A car moving with a speed of 30 m/s applies brakes and comes to a stop in 5 seco
Practice Questions
Q1
A car moving with a speed of 30 m/s applies brakes and comes to a stop in 5 seconds. What is the deceleration of the car?
3 m/s²
4 m/s²
5 m/s²
6 m/s²
Questions & Step-by-Step Solutions
A car moving with a speed of 30 m/s applies brakes and comes to a stop in 5 seconds. What is the deceleration of the car?
Correct Answer: -6 m/s²
Step 1: Identify the initial speed of the car. The car is moving at 30 m/s.
Step 2: Identify the final speed of the car. The car comes to a stop, so the final speed is 0 m/s.
Step 3: Identify the time taken to stop. The car takes 5 seconds to stop.
Step 4: Use the formula for deceleration: Deceleration = (final velocity - initial velocity) / time.
Step 5: Plug in the values: Deceleration = (0 m/s - 30 m/s) / 5 s.
Step 6: Calculate the result: Deceleration = -30 m/s / 5 s = -6 m/s².
Step 7: Interpret the result. The negative sign indicates that the car is slowing down.
Deceleration – Deceleration is the rate at which an object slows down, calculated as the change in velocity over time.
Kinematic Equations – Understanding the relationship between initial velocity, final velocity, time, and acceleration (or deceleration) is key in solving motion problems.
