A car starting from rest has a constant acceleration of 4 meters per second per second.How long will it take to reach a speed of $20 \mathrm {~m} / \mathrm { s }$ ?
A)1.25sec
B)4sec
C)5sec
D)20sec

Question

Quizplus · Accepted Answer

The time taken to reach a certain speed with constant acceleration can be calculated using the formula $ v = u + at $, where $ v $ is the final velocity, $ u $ is the initial velocity (0 m/s in this case), $ a $ is the acceleration (4 m/s²), and $ t $ is the time. Solving for $ t $ gives $ t = \frac{v-u}{a} = \frac{20-0}{4} = 5 $ seconds.

A Car Starting from Rest Has a Constant Acceleration of 4