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5. A freely falling ball of mass m = 0.5 kg passes a window 1.5 m high.
(B) If its speed at the top of the window was 2 m/s, what will its speed be at the bottom of the window?
(A) How much did the kinetic energy of the ball increase as it fell past the window?
26' A vehicle starting its motion from rest travels at a uniform acceleration of 5ms-2 for a certain time and
travels with the attained uniform velocity for another certain period of time. Then it decelerates uniformly at
5ms-2 and stops after a certain time. If the total time spent is 25s and the average velocity for the whole
motion is 20ms-1 , find the time that the vehicle travelled at uniform velocity.
Two forces F1 and F2 are acting on an object F1 =80N acting at bearing of 45° and F2 =60N acting S 45° W
A cell has a terminal voltage of 1.35 V when it is connected to a 0.9 ohm external resistor.
When the resistance is increased to 2.4 ohm, the terminal voltage is 1.44 V. Calculate the
internal resistance of the cell.
A 4kg panel of a car oscillators with frequency 5hz amplitude of 25cm . If the oscillation is assumed to be S.H.M calculate
The maximum velocity of the panel
The total energy of the panel
The maximum potential and K.E energy of the panel is 2cm from its equlibrium equation
A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 8.33 s. What is its initial velocity? Neglect air
A sprinter explodes out of the starting block with an acceleration of +2.31 m/s2, which she sustains for 1.50 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity at (a)t = 1.50 s and (b) at the end of the race?
A motorcycle has a constant acceleration of 4.33 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a)44.7 to 54.7 m/s, and (b)74.7 to 84.7 m/s?
A car is traveling to the left, which is the negative direction. The direction of travel remains the same throughout this problem. The car's initial speed is 34.1 m/s, and during a 5.87-second interval, it changes to a final speed of (a)51.1 m/s and (b)30.6 m/s. In each case, find the acceleration (magnitude and algebraic sign)
You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 139 m/s. How much time does it take for the impulse, which travels a distance of 1.73 m, to reach your brain?
