The washer slides until it stops 5. if it is given an initial speed of 2m / s. what way will the puck

The washer slides until it stops 5. if it is given an initial speed of 2m / s. what way will the puck go to stop if it is told the speed of 4m / s.

v1 = 2 m / s – the initial speed of the washer;

t1 = 5 seconds – sliding time until the puck stops at an initial speed v1;

v2 = 4 m / s.

It is required to determine the path of the washer S (meters) with an initial speed v2.

Find the acceleration of the puck:

a = v1 / t1 = 2/5 = 0.4 m / s ^ 2.

Let’s find the time of movement to stop with an initial speed v2:

t2 = v2 / a = 4 / 0.4 = 10 seconds.

S = v2 * t2 – a * t2 ^ 2/2 = 4 * 10 – 0.4 * 10 ^ 2/2 = 40 – 0.2 * 100 = 40 – 20 = 20 meters.

Answer: the puck will travel a distance of 20 meters to the stop.