Hey can someone help me with this problem. I am actuallyfrom Canada so the lesso

Question

Hey can someone help me with this problem. I am actuallyfrom Canada so the lessons they teach here may be different.Anways, you have two tennnis balls that you throw into the air. Youthrow the first one with a velocity of 15 m/s (Up). After 1.5seconds, you throw the second ball upwards with a velocity of 10m/s (Up). At what height above your hand do the two tennis ballmeet? Fir how long is each tennis ball in the air. Help I am going to write a mid-term exam on these stuff in twodays Hey can someone help me with this problem. I am actuallyfrom Canada so the lessons they teach here may be different.Anways, you have two tennnis balls that you throw into the air. Youthrow the first one with a velocity of 15 m/s (Up). After 1.5seconds, you throw the second ball upwards with a velocity of 10m/s (Up). At what height above your hand do the two tennis ballmeet? Fir how long is each tennis ball in the air. Help I am going to write a mid-term exam on these stuff in twodays

Explanation / Answer

    Let     Initial velocity of the first ball, U1 = 15m/s     Initial velocity of the second ball, U2 = 10m/s     time of travel of first ball , t1 = tseconds     time of travel of second ball, t2 = ( t - 1.5 )seconds     height at which they meet , h = ?     acceleration of each ball, a = - g     Motion of first ball :     S = Ut + ( 1/2 ) a t2     h = U1 t - ( 1/2 ) g t1 2     h = 15 t - 4.9 t2 ...............(1)     Motion of second ball :     S = Ut + ( 1/2 ) a t2     h = U2 ( t - 1.5 ) - ( 1/2 ) g ( t - 1.5) 2     h = 10 ( t - 1.5 ) - 4.9 ( t - 1.5 )2 ...............(2)     Equate the equations ( 1 ) and ( 2 ) to find thevalue of 't', then substitute the value of 't' in any equation     to find 'h'.

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