1.When striking, the pike, a predatory fish, can accelerate fromrest to a speed

Question

1.When striking, the pike, a predatory fish, can accelerate fromrest to a speed of 3.7 m/s in 0.11 s. a.How far does the pike move during this strike? 2.A driver has a reaction timeof 0.50 s, and the maximum decelerationof her car is 6.0 m/s2. Sheis driving at 20 m/s when suddenly shesees an obstacle in the road 50 min front of her. Can she stop the car in time to avoid a collision? a.How far does the pike move during this strike? 2.A driver has a reaction timeof 0.50 s, and the maximum decelerationof her car is 6.0 m/s2. Sheis driving at 20 m/s when suddenly shesees an obstacle in the road 50 min front of her. Can she stop the car in time to avoid a collision?

Explanation / Answer

Initial speed u = 0

Final speed v = 3.7 m / s

Time t= 0.11 s

(a).accleration a = ( v – u ) / t

                           = 33.63 m / s^ 2

Distance moved S = ut + ( 1/ 2) at ^ 2

                              = 0 + 0.2035 m

(b).time t= 0.5 s

Maximum deceleration a= - 6 m / s6 2

Distance   S = 50 m

Initial speed u = 20 m / s

Final speed v = 0

Distance moved in time t is S ‘ = ut + ( 1/ 2) at ^2

        S ‘ = 10– 0.75

             = 9.25 m

S ‘ < S

So. Collision is not occured

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