Determine the constant force P required to cause the 0.5-kg slider to have a speed v2 =...

Determine the constant force P required to cause the 0.5-kg slider to have a speed v₂ = 0.8 m/s at position 2. The slider starts from rest at position 1 and the unstretched length of the spring of modulus is k = 250 N/m 200 mm. Neglect friction.