When someone rides a bicycle up a slope at the initial speed of V0 = 10m / s, the acceleration is 0.4m/s2 during the uphill process, and the speed decreases to 2m / s when he reaches the top of the slope. The time taken for the person to ride a bicycle up the slope is calculated

When someone rides a bicycle up a slope at the initial speed of V0 = 10m / s, the acceleration is 0.4m/s2 during the uphill process, and the speed decreases to 2m / s when he reaches the top of the slope. The time taken for the person to ride a bicycle up the slope is calculated

It is known that the initial speed of the bicycle is V0 = 10m / s, and the acceleration is a = - 0.4m/s2; when it reaches the top of the slope, the speed is reduced to 2m / S; from the definition formula of acceleration a = V − v0t, it can be concluded that t = v − v0a = 2 − 10 − 0.4s = 20s A: the time required for a cyclist to cross the slope is 20s