13. Two boys are playing ice hockey on a neighborhood street. A stray puck trave

Question

13. Two boys are playing ice hockey on a neighborhood street. A stray puck travels across the friction- free ice and then up the friction-free incline of a driveway. Which one of the following ticker tapes (A. B, or C) accurately portrays the motion of the puck as it travels across the level street and then up the driveway? 14. Little Johnny stands at the bottom of the driveway and kicks a soccer ball. The ball rolls northward up the driveway and then rolls back to Johnny. Which one of the following velocity-time graphs (A, B, C or D) most accurately portrays the motion of the ball as it rolls up the driveway and back down? (Please note: North and South are marked on the graphs) 0 15. A ball is launched straight up with initial velocity vo (Neglect air resistance) If the initial velocity v, is doubled, the time to reach the apex of the trajectory... A doubles B: increases by a factor of 4. C: Neither of these. D Not enough information given.

Explanation / Answer

13. Option B because will slow down as it moves up the incline because of gravitational force.

14. Option D because velocity is maximum near Johny and then it decreases as it moves, reaches zero and then again increases but in opposite or negative direction.

15. Option A
Apply V=U+at , V=0 and U = Initial velocity, a=-g, t is time.
So if you double the launch velocity, time taken to reach maximum height will also be doubled.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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