<p>A boy drops a ball from 10 m high; the ball&#8217;s velocity is 5 m/s. How lo

Question

<p>A boy drops a ball from 10 m high; the ball&#8217;s velocity is 5 m/s. How long does it take the ball to reach the ground?</p>
<p>A boat is heading 5 m/s [N] up a river where the current is 2 m/s [32^oN of E].&#160; What is the velocity of the boat relative to the ground?</p>
<p>A softball is projected out of a pitching machine at an angle of 26^o upward with an initial speed of 29 m/s. If the ball is in flight for 2.5 s, how far away is the plate where the batter is standing?</p>
<p>A cat is pushing a 5 kg toy ball along a table by a 80 N force. Suppose the surface is frictionless. What is the objects acceleration?</p>
<p>A wreath is hanging on a door by two wires, as shown in the picture. If the angles of the wires are 40^o and the wreath has a mass of 50 kg, what is the tension in each cable?</p>
<p>A 35 kg box is sliding down a ramp that has a 50^o incline. The friction on the block is 10 N. What is the box&#8217;s acceleration?</p>
<p>A 20 kg backpack is placed on a 43^o incline. The coefficient of kinetic friction between the backpack and the incline is 0.26. What is the block$s acceleration down the incline?</p>
<p>A 20 kg person riding a skateboard is pushing it horizontally with a force of 40 N. The skateboard travels 5.0 m while the force is applied, starting from rest. How fast is it moving at the end of the 5.0 m?</p>
<p>A 50 kg woman sees a bug on the floor; she then jumps onto a table that is 2.0 m high. She then jumps down onto the bug and kills it. What is this woman$s gravitational potential energy before her jump?</p>
<p>URGENT!</p>

Explanation / Answer

1. A boy drops a ball from 10 m high; the ball velocity is 5 m/s. How long does it take the ball to reach the ground?

y-yo = (vo sin@) t - 0.5 g t^2 ==> 0- 10 = 0 - 0.5 * 9.8 * t^2 ==> t^2 = 10 / 4.9 ==> t = 1.428 s 2. A boat is heading 5 m/s [N] up a river where the current is 2 m/s [32o N of E]. What is the velocity of the boat relative to the ground?

boat velocity vb = 5 * cos32 = 4.240 m/s current velocity vc = 2 m/s The resultant velocity vbG = [(4.20)^2 + 2^2 ]^1/2 = 4.6 m/s

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