10 A motor cycle is traveling clockwise around a traffic circle at a steady spee

Question

10 A motor cycle is traveling clockwise around a traffic circle at a steady speed of 50 km/h. The r axis is considered eastward and y axis is northward. What are the x and y components of velocity at a point when the motorcycle is at the eastern point of the circle? [Hint: velocity is along the tangent at any point] 11. A tennis ball, initially traveling horizontally with a velocity of 13 m/s, collides with a wall and bounces back with the same speed. If the collision lasts for 0.4 s, what is the magnitude and direction of the acceleration during the collision? [Ans :65 m/s in the direction of reversed motion] 12. A champion discus thrower throws a discus with an initial speed of 26 m/s. If the discus is thrown upward at an angle of 45o, what maximum height and what range will the discus attain? What is its time of flight? Ignore the height of the hand over the ground. 13. Derive the x and y-co-ordinates of a projectile at a time t after it has been projected at an angle 0 with the horizon, with an initial speed v.

Explanation / Answer

at the eastern point of the circle

the velocity is along the tangent which means that the velocity at this point is along south

hence

x-component of velocity is vx = 0 m/s

y-component of velocity is vy = -50 km/h = -13.89 m/s

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