Question

1. a car advertisement claims that a certain car can accelerate from rest to 70 km/hr in 7 seconds (first convert to hours first!). find the cars acceleration. 5. challenge: if a ferrari with an initial velocity of 10 m/s accelerates at a rate of 5 m/s² for 3 seconds, what will its final velocity be?

Explanation:

Step1: Identify the kinematic - equation

We use the equation \(v = u+at\), where \(v\) is final velocity, \(u\) is initial velocity, \(a\) is acceleration and \(t\) is time.

Step2: Substitute the given values

Given \(u = 10\ m/s\), \(a = 5\ m/s^{2}\), \(t = 3\ s\).
\[v=10 + 5\times3\]

Step3: Calculate the final velocity

\[v=10+15=25\ m/s\]

Answer:

\(25\ m/s\)