When a blacksmith’s hammer hits a workpiece, the modulus of acceleration is 200m / s2.

When a blacksmith’s hammer hits a workpiece, the modulus of acceleration is 200m / s2. How long did the blow last if the initial speed of the hammer was 10m / s.

a = 200 meters / second squared – the acceleration of the forging hammer when hitting the workpiece;

v0 = 10 meters / second – initial speed of the blacksmith’s hammer.

It is required to determine t (second) – the period of time during which the hammer hit the workpiece.

At the end of the blow of the forging hammer on the workpiece, its speed will be zero (v = 0 m / s). Then, to determine the impact time, you must use the following formula:

a = | v – v0 | / t;

a * t = | v – v0 |;

t = | v – v0 | / a = | 0 – 10 | / 200 = | -10 | / 200 = 10/200 = 1/20 = 0.05 seconds.

Answer: The blow of the blacksmith’s hammer on the workpiece lasted 0.05 seconds.