A body of mass 5kg starts from the origin with an initial velocityof barU= (30i+40j)m//s. A constant force of F= (-hati - 5 hatj)N acts on the body . Find the time in which they- component of the velocity becomes zero .

A body of mass 5kg starts from the origin with an initial velocityof b

1.	A body of mass 5kg starts from the origin with an initial velocityof barU= (30i+40j)m//s. A constant force of F= (-hati - 5 hatj)N acts on the body . Find the time in which they- component of the velocity becomes zero .
Answer» Solution :`baru= 30i + 40 j` ....... (1) ` u=u_(x) HATI + u_(y) hatj`........ (2) `F= - hati - 5hatj` ........ (3) ` F= F_(x) hati + F_yhatj` ........ (4) comparing (1) and (2), (3) and (4) we have `u_y = 40 m//s , F_y =-5N` `F_y = ma_y , a_y = -1 m//s^(2)` `v_y = u_y + a_y xx 1 , 0 = 40 -1 xx t , t = 40` sec