Question

( y=8+-5 t^{2} )
( y=4 y+-frac{1}{2} y+2 )
( 4 y=8 )
( y=frac{4(20)}{4 x}=6 )
( u: sqrt{4 y^{2}+4 x^{2}=128+62} )
( x=10 x / 3 )

# 3. The height y and the distance x along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by y = (8t - 5t?)m and x = 6t m, where t is seconds. The velocity of the projectile is (a) 6 m s-1 (b) 8 ms-1 (c) 10 m s-1 (d) data is not sufficient.

Solution