4. Calculate the instantaneous speed (in m/s) at

the 10-second mark for a car that accelerates

at 2 m/s from a position of rest.

The instantaneous speed is 20 m/s

Explanation:

The instantaneous speed is the speed of an object at a particular

moment in time

To calculate instantaneous speed, we need to divide part of the total

distance traveled by time

We need to find the instantaneous speed at 10 seconds for a car that

accelerates at 2 m/s² from a position of rest

That means the car accelerate from rest

The initial speed u is zero

We can find the instantaneous speed at 10 seconds by using the rule

→ v = u + at

→ u = 0, a = 2 m/s², t = 10 seconds

Substitute these value in the rule

→ v = 0 + 2 * 10 = 20 m/s

The instantaneous speed is 20 m/s