physics question!?

Question

1)what is the weight of a box that exerts a parallel force component of 330 N
and a perpendicular component of 390 N?

2)a net force of 15 N is applied to a cart with a mass of 2.1 kg
a) what is the acceleration of the cart?
b) how long will it take the cart to travel 2.8 m starting from rest?

3)a baseball is hit staright up into the air with a speed of 33 m/s.
a) how high does it go?
b) how long is it in the air?

please show how you did it if you can

Answer 1

1) Angle
A= arcTan(parallel force component /perpendicular component )
A= arcTan(330/390)= 40.2 degrees
W=parallel force component /sin(A)
W= 330 /sin(40.2)=510 N

2)
a) We know that F=ma
a=F/m= 15/2.1=7.1 m/s^2

b) S=0.5 a t^2
t= sqrt (2S/a)=
t=0.88 sec

3) V=gt
t=V/g
h= 0.5 g t^2
h= 0.5 g (V/g)^2
h= (V)^2 / (2g)
h= (33)^2 / (2 x 9.81)
h=56m

b) t=V/g=
t=3.4 s