A hockey puck is hit from near mid-field with a speed of 7.00^m/s, 52.0ft away f

Question

A hockey puck is hit from near mid-field with a speed of 7.00^m/s, 52.0ft away from the goal. It comes to a full stop at the goal line. Use 1ft = 30.5cm. Assuming the friction force acting on the puck is constant, find the puck's acceleration. A. -1.47 m/s^2. B. -1.54 m/s^2 C. -1.93 m/s^2 D. -1.80 m/s^2 E. -2.00 m/s^2 How much time does it take for the puck to come to a stop? A. 4.53 s B. 4.43 s C. 4.39 s D. 4.06 s E. 4.95 s How fast must the puck be hit to cross the goal line moving at 2.00 A. 8.77 m/s. B. 8.17 m/s. C. 8.36 m/s D. 7.54 m/s E. 7.28 m/s

Explanation / Answer

u = 7 m/s, d = 52ft = 52*0.305 m

v = 0

(I) from kinematic equations

v^2 -u^2 = 2as

0 -7^2 =2*a*52*0.305

a = -1.54 m/s^2

correct option is (B)

(II) from kinematic equaitons

v = u +at

0 = 7 -1.545*t

t =4.53 s

correct option is (A)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.