1.A car starting from the rest attains a speed of 40 m/s after 20 s. determine the following:
a. average speed of the car
b. acceleration
c. distance covered while accelerating.

Answer:The calculations for the scenario where a car starts from rest and reaches a speed of 40 m/s in 20 seconds are as follows:a. Average speed:Average speed = (Initial speed + Final speed) / 2Average speed = (0 m/s + 40 m/s) / 2 = 20 m/sb. Acceleration:Acceleration = (Final speed - Initial speed) / TimeAcceleration = (40 m/s - 0 m/s) / 20 s = 2 m/s²c. Distance covered:Distance = Initial speed * Time + 0.5 * Acceleration * Time²Distance = 0 m/s * 20 s + 0.5 * 2 m/s² * (20 s)²Distance = 0 + 0.5 * 2 m/s² * 400 s² = 400 m

Answered by weldonjohnmendoza | 2025-03-02