The body under the action of a constant force of 50 N within 10 s changed its speed from 36 km / h

The body under the action of a constant force of 50 N within 10 s changed its speed from 36 km / h to 216 km / h. Determine the change in momentum and body weight.

Initial data: F (constant acting force) = 50 N; t (duration of movement) = 10 s; Vн (initial speed) = 36 km / h = 10 m / s; Vк – the achieved speed (Vк = 216 km / h = 60 m / s).

1) Body weight: F = m * a = m * (Vк – Vн) / t, whence m = F * t / (Vк – Vн) = 50 * 10 / (60 – 10) = 10 kg.

2) Change in impulse: ΔP = Рк – Рн = m * (Vк – Vн) = 10 * (60 – 10) = 500 N * s.

Answer: The mass of a moving body is 10 kg, the change in momentum is 500 N * s.