Question

40. For a projectile motion in x-y plane on some
planet, the position coordinates as a function of
time t are given as x = 4t and y = 4t - 5f, where x,
y are in metre and time t is in second. Assume x is
horizontal and y is vertical. The horizontal range of
the projectile is
(1)
3
-m
8
(2) 6 m
8
16
(3)
E
(4)
5​

Answer 1

1. x = 4t and y = 4t - 5t

now, Vx = dx/dt

Vx = d(4t)/dt

Vx = 4m/s

Vy =dy/dt

Vy = d( 4t - 5t)/dt

Vy = -1m/s

2. now, V = underrought of Vx square +Vy square

V square = 5m/s

3.