Question

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 - 5t²) meter and x = 6t meter, where t is in second. The velocity with which the projectile is projected is

(a) 8 m/sec 

(b) 6 m/sec

(c) 10 m/sec 

(d) Not obtainable from the data

Answer 1

Correct Option  c) 10 m/sec 

Explanation:

v_y = dy/dt = 8-10t ,   v_x  = dx/dt = 6

  

at the time of projection i.e. v_y = dy/dt = 8 and v_x = 6