Q: A Projectilie is thrown at an angle of 60⁰  with the horizontal  with an initial  speed of 20 m/sec, with  H being highest point of its  trajectory   another particle  P   ^{is now}   forced to move  along the same trajectory as that of the  projectile  such  that  its speed is continuously  increasing  when the particle P is at H, mod vector vp = 20 m/sec , mod vector ap -= 50 m/sec^{2, ,} then  acceleartion vector ap, at H equals(take g = 10 m/sec²