Question

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1
D ( R=frac{u^{2} sin 2 theta}{g} )
( R max ) when ( Q=45^{circ} )
( Rightarrow quad frac{u^{2}}{g}=0.4 )
( Rightarrow quad u^{2}=4 )
( Rightarrow quad u=2 m / s )
( therefore U_{x}=4 cos theta=frac{u cos 45^{circ}}{=sqrt{2} m / s cdot 3} )

# 17. A grasshopper can jump a maximum horizontal distance of 40 cm. If it spends negligible time on the ground then in this case its speed along the horizontal road will be (1) 1 m/s (2) 2 m/s (3) V2 m/s (4) 2/2 m/s

Solution