In a 45 s interval, 565 hailstones strikes a glass window of area 1.107 m^2 at an angle 35 to the windows surface. Each hailstone has a mass of 5 g and a speed of 10.1 m/s.

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.