“horizontal velocity causes vertical retardation” true or false. J

1.	“horizontal velocity causes vertical retardation” true or false. Justify
Answer» GIVEN,Retardation =10%If there is no friction then,By the equation of the motion,v 2 =u 2 +2ghv=0h= 2gu 2 Now,When there is air resistance 10% of the gravity.g eff =g+0.1g=1.1gThe maximum HEIGHT will be,h 1 = 2g ef u 2 Therefore, the difference is h 1 −hu 2 2g ef − 2gu 2 So,CHANGE in height is:2gu 2 − 2g ef u 2 = 2gu 2 − 2gu 2 (1− 1011 )Thus the percentage change in height is:= 2gu 2 2gu 2 (1− 1011 ) ×100

Discussion